LED light source compared with CFL

Can you replace the CFL with a brighter one?
From the beginning, we will start by discussing- different light resource products.
The incandescent lamp also went to called the electric light bulb, its working principle is the current through the filament (tungsten, melting temperature reached to 3000 degrees Celsius) it generates heat, meanwhile it generates light. the light is bright,from strength to strength The filament temperature is high,So called incandescent lamp.in fact , The Incandescent lamp, a large amount of electrical energy will be converted into heat, only a few (probably less than 1%, had not been calculated) can be converted into useful energy. So the power of incandescent lamp is more.
a fluorescent lamp：   fluorescent lamp or fluorescent lamp, its working principle: In a few words the fluorescent lamp is discharge tube that was involved in gas。One has process to gas discharge to releaseing ultraviolet   (main wavelength as 2537 =2537 × 10-10m). Electric energy can be converted into about 60% UV consumed. Other energy is converted into heat energy. It is generally the ultraviolet light into visible light efficiency is about 40%. So the efficiency of fluorescent lamp is about two times the same power tungsten filament lamp. （60% * 40% = 24%）.
LED lamp (Light Emitting Diode) also known as light-emitting diode, is a solid state semiconductor devices, can be directly converted into electricity to light.
LED English as a light emitting diode, LED light-emitting diode lamp beads is the abbreviation abbreviation LED, which is a popular title.
Especially The LED COB Modules tunneling is more and more popular during recent years,
LED Modules are the latest in efficient mounting systems for LED displays. Modules are compact in size, may contain several LEDs (series-parallel connection)encased in a package.Due to the integrate of the semiconductor light-emitting diode chip technology , LED photoelectric conversion efficiency to be improved, especially in high-power LED, because of its high power ,High-Power LED Modules demand for quality and Mate- rials Handling is higher. to find out more about LED products
Equivalent Wattages of LED and Incandescent BULBS

LED bulbs use 85% less energy and last up to 20 years
longer than incandescent bulbs.
Light Bulb-LED&CFL&Halogen&Incandescent Comparison Chart

led vehicle lights

As with LED interior lighting, which almost no heat source, no heat, greatly reduces may occur at any time of the accident in the vehicle driving, thereby ,reduce the serious security hidden danger. LED lamp life of up to 50,000 to 100,000 hours, ie over 5-10 years, may not need to be replaced during the life of the vehicle usually. LED lights can convert electrical energy into light energy directly, able to meet the needs of environmental protection and energy saving. don’t need the starters, and rectifiers for start,it can be powered light directly, energy saving Most likely a new identity., So fast does light travel that it is difficult for us to imagine its speed. as the brake lights use . In contrast, one incandescent light bulb, only to 12%-18% of electrical energy into led light, the other electric energy into heat energy. Start time is longer than ordinary incandescent bulb, typically 100-300 milliseconds,and LED start time is only a few tens of nanoseconds. Crucial for high-speed brake lights, such a time gap means difference of 4-7 meters braking distance, improving the safety of the vehicle driving.

What are the best led strip lights—choose led

Definition:
Flexible Led strip refers to the strip of LED set mounted on FPC (flexible printed circuit board) (Attachment: Rigid Strip with PCB hard board), with SMD package high-brightness LED as light source, every three lights as a unit, will LED chip welding on the soft circuit board.
Components:
SMD led flexible light strip waterproof divided into four :
Epoxy, waterproof casing, solid waterproof (U-groove + resin), filling plastic waterproof (casing + resin) Which conventional PU polyurethane with a high temperature resistance (tested in 40 ℃ -. -20 ℃, UV, folding, wear and other features)
Waterproof:
Not waterproof – bare board –IP00,
IP65 Epoxy waterproof,
IP67 silicone casing waterproof,
IP68-PVC tube filled waterproof (waterproof casing + Glue / half sleeve + Epoxy).Note: Epoxy glue is AB glue, the ratio was 1: 1,
casing material is silica gel (softness is good, for a long time will not yellowing, are not compatible with AB glue),
PVC (transparent, combination with AB glue, a long time will yellowing). Low pressure is to add a switching power supply, is a step-down rectification.
LED bead colors: red wavelength:620-625nm (nm)
yellow wavelength of 590~595nm
blue wavelength 475~480nm
green wavelength 520~525nm is cast beyond the above,
beyond the wavelength range is partial color,
white is usually defined by color temperature,
divided into: warm white color temperature 2700K-4000K (Kelvin) is white temperature 4000K-5000K cool white color temperature above 6000K.Divided into monochrome (white –5000K above,
warm white –2700K above, red, yellow, blue, green, pink, purple),
which is white, warm white, mostly blue followed.
There is a colorful (RGB) with the Symphony of the (plate than the IC,, there is flowing water effect, with digital effects like).
3.2.3, the brightness of brightness lamp beads with flux (lumens) lumen (LM) is defined, the higher the value, the higher the lumens brightness. There are several on the market now: 3528 (3-4LM, 4-5LM, 5-6LM, 7LM above) the first two are generally used for soft light strip, which is used for lamps, panel lights; 5050 (10 12LM, 12-15LM, 16-18LM) all of these can be used for flexible light strip, generally jewelry cabinet light bar that is hard for high brightness light bar is generally used 16-18LM’s.
Lamp specifications:
0603, 0805, 1210, 3528, 5050 refers to the LED size. size unit (inch / Metric), below are the details of these specifications: 0603: conversion to metric is 1005, which represents the length of LED components is 1.0mm, the width is 0.5mm. Industry referred to 1005, British, it is called 0603.
0805: conversion to metric is 2125, which represents the length of LED components is 2.0mm, the width is 1.25mm industry referred to 2125, British, it is called 0805.
1210: conversion to metric is 3528, that is represents the length of LED elements is 3.5mm, width is 2.8mm. Industry referred to 3528, British, it is called 1210.
3528: This metric is called, means that the length of the LED elements is 3.5mm, the width is 2.8mm, the industry referred 3528.
5050: This is also called the metric that indicates the length of the LED elements are 5.0mm, width is 5.0mm, the industry referred to as 5050. Most manufacturers of SMD lights are used mostly in 3528 and 5050,

LED solution

Several of car internal and external lighting LED driver solution
LED (Light Emitting Diode), light-emitting diode, is a solid-state semiconductor devices, which can be converted directly into electricity to light. In recent years, the applications continue to expand, from the portable device backlight traditional to large size LCD display / LCD TV backlighting, automotive and general lighting field. This article will be devoted to a variety of LED driver solutions, suitable for car light, This paper will be devoted to the various LED drive scheme suitable for automotive lighting applications, and discusses some typical applications. and discuss some typical applications.   LED offers many advantages for automotive lighting applications,LED applications is very wide in car field, but can be summarized as interior lighting and exterior lighting (see Figure 1).
but simply classified into internal and external lighting lighting . External lighting as the headlight, Obe Terua, interior lighting including internal convenient and comfortable lighting and instrument panel backlight.
A lot of factors to promote the application of automotive LED lighting. With headlamp for example, the use of LED as a light source has many advantages:
1.1 to design led flexible or novel
LED physical size is very small, can be used to develop extremely compact, thin modules. Compared with halogen and xenon lights, multi-string LED module requires a smaller, simpler lens and a light-diffusing sheet hardware. And a plurality of LED light source is easier to guide,
greatly reduce the impact that project in engineering design.
1.2 light intensity and energy efficiency continues to improve LED light intensity is fast on the lift curve, showing every 18-24 months flux will double trend. LED light output has more than halogen lamps,
future LED optical performance will also be able to rival the xenon lamp.
1.3 high reliability and long life
As long as the car headlamp effective thermal management module to maintain a low junction temperature, and protect it from the switch is turned on / off, the impact of the pulse and the battery current spikes may occur during can’t affect. Expect them to continue to use in the whole life cycle of the car.
1.4 significant energy savings
Compared with other solutions, car headlamps use fuel / energy is much less. Use high efficiency intelligent power Technology / chip, rather than a number of external components required general IC, can be more energy efficient.Therefore, LED automotive lighting applications in increasing, and by many car manufacturers as a design selling point.
2 LED driver solutions compare
LED automotive lighting applications in a variety of different applications of LED current requirements also vary, so the need to combine specific application requirements, select the appropriate LED driver solution.
One of the main features LED driver solution is the steady flow in a variety of working conditions, regardless of the input conditions and forward voltage variations. Driver programs must comply with energy efficiency, form factor, cost and safety aspects of the application requirements. Meanwhile, the selected solutions must be easy to use and strong enough, to meet strict environmental application specific.The typical LED driver program in automotive applications including resistors, linear LED driver, LED driver and innovative lighting switch management LED driver. In general, according to the size of LED current in the application, in low current application of 20 to 200 mA, can using discrete components (i.e. resistance) or linear driving solutions; in the secondary current application of 200 to 500 mA, can choose linear or switch driver solutions; and in high current applications is greater than 500 mA， in general please selection switch drive solutions.
In fact, the resistance is the easiest, lowest cost ,LED current limiting solutions, but they are not “steady flow”, but the LED forward voltage variation and input supply voltage variation and lead to current changes, will be causing the LED brightness variation, simply LED maximum current limit. Although the low cost of such programs, but also the lowest energy efficiency, and the existence of LED thermal runaway screening costs and thermal runaway problem.CCR is a higher performance solution and it has more lower cost than the switch driver. suitable for LED lighting applications in current is less than 200 mA. CCR cheap and rugged, providing a constant brightness over a wide voltage range, CCR maximum operating voltage of 50 V, the battery can withstand load dump. CCR provides SOD123, SOT123 and DPAK different packages to work (125 ℃)
This solution can reduce or eliminate the generation LED filter stock, so that a lower total cost of the program. CCR maximum operating voltage of 50 V, CCR provides SOD123, SOT123 and DPAK in different packaging, can work under strict thermal environment (125 ℃), In addition, CCR does not generate electromagnetic interference, easy to design.

LED lighting project

Lighting technology: the basic knowledge about LED lighting project:
in recent years, LED lighting project received strong government support, the construction of city lighting engineering as an important measure to improve and beautify the environment of the city. What is the LED lighting project? What required to do for the LED lighting engineering?What do we care about it?
Below, we will give you a brief introduction about the basics of LED lighting engineering. before introducing the basics of LED lighting project, let’s repeat LED lighting works.LED (Light Emitting Diode), light emitting diode, is a solid state semiconductor devices, which can be directly Electricity into light. LED’s heart is an semiconductor wafer, the wafer is attached to an LED on the bracket, one end is negative, the other end connected to the power supply is Positive, so that the whole chip is epoxy encapsulated. The semiconductor wafer is composed of two parts, a Points are P-type semiconductor,it inside the hole dominated the other end is an N-type semiconductor, here is mainly electronic. ButWhen connecting the two semiconductors, to form a “P-N junction” between them. When the current through the wire into the semiconductor wafer.
Electronics will be to P area, complex in area P electrons and holes, , then it will emit energy,This is the principle of the LED light. The wavelength of light that is the color of light, forming a PN junction is made ​​of a material determined.
1.LED digital city projects of energy saving and efficient lighting brightness.
Also known as LED tube, LED guardrail lamps, LED lights outline; this product is used to building body contour installation, KTV Door head or advertising signs,
and road and bridge parapet lighting project; reach colorful water, chasing, scan results;
if made ​​of LED screens (LED yard signs) can be a variety of dazzling animation and flowers, You can also play video; the text and map Case. LED digital tube classified by the effect can be divided into: monochromatic light colors (red, yellow, blue, green, white); colorful can be divided into: single-stage colorful gradual transition; really sixth, really eight, paragraph 12 , 16 segments, 32 segments, 48 segments and so on. According to the control method is divided into: internal and external control. Internal control: control the led with The IC chip in tube. Directly connected the power after flash variety of pattern.explained the concept simply of external control is simply the need for an external controller; controller system is divided into offline and online systems; online system refers to the control system attached to the computer (more for LED digital tube screen); offline system work is not required attached to a computer,Input control signal to drive LED after connected power. to pay attention to installed outside the control signal.usually for signal input from the male, female for signal output;
2.LED rainbow tube LED rainbow tube
Also known as LED lights, LED rope light; is one of the most commonly used product on lighting project, and the price is relatively cheap, is Customer favorite LED lighting products. Mainly applied to the cost is not high, the effect is not too gorgeous place;
can make build Floor Body or signs outline; iron word or shape of the sides; KTV cove ceilings or decoration. LED rainbow tube classification
LED rainbow tube classification
The second round, round three lines, flat line, party line, flat three lines, flat four lines, flat five lines, flat seven line etc.; there are red, yellow,Blue, green, white, red, blue, red, red yellow blue, red yellow blue green;including LED lights, LED flexible neon lamp,make the installation ,try not take out all led form the reel, then the entire pull to the building body is provided; because if too much force will lead to a lamp with a line break(causing the lamp with irreparable damage),
If there is no light in the middle, you can cut the unit that does not light with a razor blade, and then use the middle connector docking.
In addition,must be reminded that,in the use of wires to the attention of the negative and power;
The power consumption is not to large, the main line using a national standard 4 Square millimeter of the main line, the line transformer to lamp using 2.5 square millimeter wires. The signal line as far as possible the use of ultra five network.Transformers and controller measures pay attention to waterproof rain.
We discussed the LED lighting engineering products — LED decorative lamp series LED star light
A LED strip light (LED light string), LED net light, LED waterfall lamp, LED stars.These LED decorative lamp lighting in general use of flowers or small landscape. For example, to do lighting effects to a tree, you can use multiple strings LED star light, star lights around LED in the branches, and through the controller flashing, became flashes colors

LED industry on the way

Perhaps mainly because of the policy supported which is given
by countries, many LED lighting companies at first fancy state subsidies.the few years,Under the drive of many interests, many companies have begun to enter the LED industry, there will be more LED companies into and The factory began producing LED product. So more and more LED lighting enterprise established, only a few years there are even more than the tens of thousands of enterprise. However, the greater the cake, the more people want to eat cake, In fact, for some enterprises, the confidence in the LED is not more to maintain in the “energy”,and so with the further deterioration of the economic crisis, the slow development of civil LED lighting penetration, while as the intensifies of vicious competition, makes a lot of LED lighting enterprises both in funds chain or market sales have experienced a bomb-attack, exposing a hidden crisis, so the closures will come.companies reported quarterly report is weakThe so-called ideas determine, to form their own brand USP Perhaps it is Because when engines impure, not really, not good at marketing planning, many Flexible LED Strip Lights companies have encountered unprecedented Waterloo, also largely affected the reputation of the entire LED lighting industry. The factory to follow its protectionist course.Therefore, I believe that, for LED lighting companies, LED lighting industry needs confidence and more importantly,the work is quickly reined in the transformation of business ideas, new understanding of  outdoor led lights from the awareness and attitude, stop given by the national policy as a means of making money at the same time Do LED lighting this feather deemed to keep everyone happy, like in my hand tightly, otherwise it really makes enterprises more quickly into a poor state of development, immortality is already the midst of sadness!From a development perspective, the prospects for the development of the LED lighting business is actually getting bigger, both at the technical level or at the economic level, we can foresee, however, very critical outdoor led light companies in order to find the way out, they must the To create the LED industry already has a certain industrial base, to solve the key technology R & D upstream is relatively weak, at the same time use of brand ideas come and re-operation of the enterprise, and the only way, businesses can keep their footing, and goes far. on the way may be the next big thing in LED industry.

LED s—So long as you live a better life than i

Currently, many LED companies, in order to get more profits in the fierce competition, their products in fact exist within a lot of problems. However the layman can not see   any transmission of the disease of their products. Teach you how to distinguish good led lights & led COB display products, it need to reach these kinds of standards.
LED display on the ambient temperature is very picky. Theoretically at a room temperature of 25 ℃, the best of their work status. But actually, the outdoor display in the application ambient temperature is quite complicated, summer maximum temperature may be above 60 ℃, the lowest temperature in winter may be -20 ℃ below. LED, IC efficiency and performance are inconsistent brightness inconsistent display screen body as a whole will naturally become spent. Under different temperature conditions, the red, green, and blue three lamp brightness decay and fall is different, at 25 ℃, the white balance is normal, but at 60 ℃, three-color outdoor led lights brightness declined, and the attenuation values do not match, it will produce the entire screen brightness down and cast the phenomenon, will decline in the quality of the entire screen. The internal display Other positive efforts to the large number of improvements in aspects of the design, process, and can effectively control the temperature of the external environment on the ultimate effect of the display, as much as possible of the LED display can be in a variety of complicated conditions perfect display.
Power supply also affects the quality of an important part of an  led lights display system. Power under different temperature conditions, the stability of their work, the output voltage value and with a load capacity will vary, because it is responsible for logistical role, its ability to protect the direct impact on the quality of the screen. Performance and stability, power supply prices of different brands and specifications are also considerable differences. Not just look at the low price without looking at the performance and quality to choose.
A well-known brands such as LED, is to go through the long-term market hard work to get recognized by the society. Enterprises depending on the brand for life and will never be easy for short-term interests and hurt their brand image.

LOOK AT THE LED FROM DIFFERENT PERSPECTIVES

 Structure and properties of materials:

1,The size of chip. The same kind of chip, the larger the size, the higher the brightness, the stronger capacity, stable performance, the better, of course, price is also relatively higher. Chip size is now mainly: 9MIL, 10MIL, 12MIL, 14MIL and 23MIL so on.
2, The light emitting efficiency.LM emitted value from per watt is called luminous efficiency. This is an important standard to judge whether the energy-saving for LED. Incandescent lamp 14.4LM / W, fluorescent lamp is about 51LM/W, fluorescent lamp is about 51LM/W, the neon lights around 43LM/W, LED is up to 150LM/W, Note that only the white LED can reach such a high light efficiency, red, yellow, blue generally relatively low.
3,Service time. The LED service time everyone thinks is 100000H.In fact,the  LED product in 10 or 20 years before it can be up to 100000 hours, the best LED life is expected to only 50,000 hours by far. Incandescent 1000 hours, 2000 hours fluorescent, neon 10,000 hours. The so-called 100000 hours,but scientists in the laboratory at room temperature estimates obtained.due to differences in the package equipment used and production of technical differences and different management or different users…. the resulting in life is not the same. SMD LED, life can reach 40,000-50,000 hours; Piranha LED, life of 30,000 hours, in-line LED, life is 10,000 hours. Of course, with the chip and package technology progress these data will gradually improve. LED life is when the luminance of LED is 70% when the original brightness, we determine the LED life so far. LED life is when the LED luminous intensity is 70% of original brightness time, we determined that the LED life is over.
4,The quality of circuit board. LED of the same quality, the quality of the board will have an important impact on the life of the LED
The Circuit board is divided into aluminum, fiberglass panels, half glass plates, cardboard. The best quality aluminum plate, the best cooling effect, but the cost is too high, Follow, we will talk about Module, the color of piranhas, straw hat module is generally used cardboard or half glass, half glass patch series for general use or the glass plate. Colorful and full-color series have at least a half glass.
5,Full color range of IC . IC has dozens of different IC, the performance, stability and price are different, resulting in the finished product cost is different.
6,Solder：solder brightness is full, here is no cold solder joint, This affects the thermal and stability

SOME MATTERS COUNTER LIGHT BAR INSTALLATION SHOULD BE NOTED

Several points counter light installation should pay attention
<img src="http://www.ledlightmake.com/blog/wp-content/uploads/2014/08/Install-conter-strip.jpg" alt="" />
Install conter strip(lpd6803 led strip)
Install conter strip1

1, can not be pressure. Light bar counter made ​​of aluminum plate, pressure will cause the deformation

2, do not destroy the cable when connecting the circuit board. Connecting line for advanced tungsten silver wire, it’s good electrical conductivity.

3、Drag the product the ground above. to avoid scratching or damage the shell.

4, Please note that electricity standard(product’s paramtmer) when test the product first time. And should be strictly in accordance with the positive and negative power to connect cabinet lights at the correct voltage.

To avoid damage to the cabinet lamp.

5、“For many are lamp in couter, please ensure that parallel cabinet lights and power supply, if the series is too long. it will lead to unbalanced for the voltage.

Brightness is different, does not recommend more than 4 meters for a tandem unit, please ensure that the maximum power to echo channel is within the maximum power adapter.

ABOUT CALCULATION OF LED STRIP

Matching calculation and power supply with power LED strip is very familiar for city lighting engineering. following we will talk about the process of strip project plan. calculate the number of LED strip lamps for the project. It should be noted that the LED lights can be divided into three groups cut using. 60 per meter LED lights with LED’s in each length of 50mm,30 per meter LED lights with LED’s in each length of 100mm . Understand this then you can calculate the actual number of LED lights need. The general reserve length of about one meter is good. so as to avoid excessive waste.Because the buy LED lights is not distributing power, so we need to calculate the required power supply. then matching power supply. Power LED lights with different so for the power matching to carefully choose.for example if the purchase is 5050LED lights, matched power is 12V, the 4A by specification, then a power supply can only take 6 meters 5050LED lights.Because 5050LED lights per meter power is 7.2W, a total of 6 meters of 43.2W, while the power supply rated power is 48W, is generally not recommended to use the power of full load, because that power of life for a great impact, suggest to use only the power of 95%. If I need the 100 metres, the 4A power corresponding to be equipped with at least 16pcs.

LED lights with controller: for RGB lights bring that effect must be equipped with a controller only, for the lpd6803 led strip must be equipped with the controller to have effect, but a controller can control the LED lights with lengths from 5 meters to 20 m range, which one is selected as controller specifications.Thus, in the purchase of RGB lamp belt, also need according to control length controller in addition to controller, or purchase another RGB amplifier (each amplifier can be extended to 5 meters) Do not mistakenly think that a controller can achieve the control requirements for all RGB lights, this is the wrong point of view. For example, the purchase of 100 meters of RGB lights, while the controller selects a conventional controller, which controls the scope of each controller is 5 meters kind. Then 100 meters of RGB lights need to be equipped with the RGB controller 20 pcs, or buy an RGB controller, buy another 19pcs amplifier
<img src="http://www.ledlightmake.com/blog/wp-content/uploads/2014/08/WS2812B-string-function1.jpg" alt="" />

SHARE–LED ADJUSTABLE LIGHTING

In the lighting industry, the people often have a misunderstanding for LED light dimming that compared to other light sources (fluorescent, metal halide and sodium, etc.).the dimming LED relatively easier. But the reality is the application of LED light dimming technology Is not satisfactory for engineering .why is this? To answer these questions, we must first understand the volt ampere characteristic of LED.then to help readers to understand and master the LED light dimming and its application.
So from the volt-ampere characteristic of LED, we can know that LED light dimming can’t simply by reducing the input voltage and input current of LED to achieve, in addition to LED of a sine wave waveform is different from the incandescent lamp, therefore can not simple obtained by changing the conduction angle,so as to achieve changes in effective value (effective dimming) purposes.

LED Triac Dimming:
Ordinary incandescent and halogen lamps usually adopts SCR dimming. Because incandescent and halogen lamps is a pure resistance device, it does not require the input voltage is a sine wave, because it is always the same between the current waveform and voltage waveforms, so no matter how sine wave voltage waveform deviation, as long as the change of the input voltage, you can be dimming(adjust the light).However triac dimming to adjust the LED light source to produce unexpected problems, that is, the LC filter input will make oscillation with SCR. this oscillation for incandescent lamps is insignificant(lamp makes the eyes do not see this oscillation), but to drive power will be the production of LED audio noise and flicker. non sinusoidal waveform will produce serious interference signals in the circuit (EMI) power network pollution, serious will make the grid paralysis.

Hereto, you might ask: ” to reduce the voltage or current and the SCR dimming methods are not suitable for LED light dimming, then in what way is the most appropriate?.”

PWM (pulse width modulation) dimming can be a good way to solve the above problem, because LED is a diode, it can achieve fast switching, switching speed which allows may reach microsecond above, is unmatched by any light-emitting device. Therefore, as long as the power source into a constant current pulse, with the method of changing the pulse width,it is possible to change the brightness, this method is called the pulse width modulation (PWM) dimming method.This is dimming switch like a up to microsecond or switch gate, because the gate switch frequency soon,we are unable to recognize their state of the switch with the naked eye the result is that we can only pass much water downstream to recognition speed its switching frequency. In addition, as the gates flow changes the duty cycle of the output (effective flow rate), without changing the instantaneous pressure and the instantaneous water flow rate, so that the gates of microseconds up to a switching operation will not affect more than the work of flow, because the moment instant pressure and instantaneous flow does not change, change is the electric power generation of loader. and so on PWM (pulse width modulation) dimming method does not change the input instantaneous voltage and instantaneous current of LED PN junction, to change the duty cycle of the output current, thereby changing the brightness.

Thus, LED PWM (Pulse Width Modulation) dimming method has the advantages as following:

1, does not have any LED chromatography offset, because the LED is always working at full amplitude between current and 0V.

2, there is a very high dimming accuracy, because the pulse waveform can be controlled to a very high accuracy, so it is easy to achieve 1/10000 accuracy.

3, even, to dimming in a wide range, also won’t happen the flicker phenomenon. Because does not change the constant current source condition (step-up ratio or step-down ratio), the more impossible to geted the overheating problems.

4, can be with the digital (DALI / DSI / DMX 512 ) control techniques of combining, because the digital control signals are easily converted into a PWM signal.

Although LED PWM (Pulse Width Modulation) dimming has many advantages, but need to pay attention to the following two questions:

1,A pulse frequency of choice, because the LED is in a fast switching state, if the operating frequency is low, the human eye will feel flashes. To take full advantage of the human visual residual phenomenon, it should be higher than the operating frequency of 100Hz, preferably 200Hz.The heavy rain was the cause of the flood.

2, The dimming was the cause of whistling, although the human eye can not detect more than 200Hz, but they are all up to 20kHz range of human hearing. At this time it is possible to hear the slightest sound. There are two ways to solve this problem, one of the switching frequency up to 20kHz or more, out of the range of human hearing. Another way is to find sound devices and to be deal with.
the control signals are used DALI (digital Addressable lighting interface) technology, combined with digital lighting control system, fully digital LED control product line. have been very good to solve the above problems, Most important feature of DALI (Digital Addressable Lighting Interface) technology is a single lamp with separate address, or any single lamp lights set precise dimming and switch control via DALI system software,on whether those in strong electric lamps or different loop circuit lamps. Other words DALI system software has strong individually addressable for the led which same or a different electrical circuit loop.enabling individual control and arbitrary grouping. This idea brings great flexibility for lighting control,The user was delighted to be make the lighting solutions designed to meet their needs as required, even after the end of the installation,it’s can still modify any control requirements.Now, the DALI interface is not only limited to light adjustable fluorescent lamp ballast,electronic transformer tungsten halogen lamp, gas discharge lamp electronic ballast, LED uses the DALI interface dimming;control equipment also includes: a radio receiver, a relay switch input interface. All kinds of button control panel, including LED display panel has a DALI interface, which will make DALI applications(or ) more and more widely, the controller to expand from an office minimum to multi room building, expanding from a single store to the Stars Hotel.

Summary:
Although at this stage of the LED dimming applications was chaotic, and there are still some problems and obstacles, but there is no denying the fact that LED dimming prospects are bright. As long as we maintain a cautious attitude, develop science and psychology responsible LED dimming technology, to LED dimming technology promotion, to make good use of the LED dimming technology, then the LED dimming products bring us benefits, to bring the benefits of lighting industry, to bring the benefits of human beings in the not too distant future.

LED LIGHT SOURCE COMPARED WITH CFL

Can you replace the CFL with a brighter one?

From the beginning, we will start by discussing- different light resource products.

The incandescent lamp also went to called the electric light bulb, its working principle is the current through the filament (tungsten, melting temperature reached to 3000 degrees Celsius) it generates heat, meanwhile it generates light. the light is bright,from strength to strength The filament temperature is high,So called incandescent lamp.in fact , The Incandescent lamp, a large amount of electrical energy will be converted into heat, only a few (probably less than 1%, had not been calculated) can be converted into useful energy. So the power of incandescent lamp is more.

a fluorescent lamp：   fluorescent lamp or fluorescent lamp, its working principle: In a few words the fluorescent lamp is discharge tube that was involved in gas。One has process to gas discharge to releaseing ultraviolet   (main wavelength as 2537 =2537 × 10-10m). Electric energy can be converted into about 60% UV consumed. Other energy is converted into heat energy. It is generally the ultraviolet light into visible light efficiency is about 40%. So the efficiency of fluorescent lamp is about two times the same power tungsten filament lamp. （60% * 40% = 24%）.

LED lamp (Light Emitting Diode) also known as light-emitting diode, is a solid state semiconductor devices, can be directly converted into electricity to light.

LED English as a light emitting diode, LED light-emitting diode lamp beads is the abbreviation abbreviation LED, which is a popular title.

Especially The led cob or ir led strip  tunneling is more and more popular during recent years,
LED Modules are the latest in efficient mounting systems for LED displays. Modules are compact in size, may contain several LEDs (series-parallel connection)encased in a package.Due to the integrate of the semiconductor light-emitting diode chip technology , LED photoelectric conversion efficiency to be improved, especially in high-power LED, because of its high power ,High-Power LED Modules demand for quality and Mate- rials Handling is higher. to find out more about LED products

Equivalent Wattages of LED and Incandescent BULBS
difference between led and cfl bulbs1

LED bulbs use 85% less energy and last up to 20 years
longer than incandescent bulbs.
<img alt="" src="http://www.ledlightmake.com/blog/wp-content/uploads/2014/07/difference-between-led-and-cfl-bulbs1.jpg" class="alignnone" width="602" height="277" />
Light Bulb-LED&amp;CFL&amp;Halogen&amp;Incandescent Comparison Chart
difference between led and cfl bulbs2
difference between led and cfl bulbs

COMPARISON OF PIRANHAS, SMALL STRAW HAT AND SMD

Comparison of piranha LED , small straw hat and SMD According to the type of sub package, now on the market there are three main types of cars for LED indoor light design of the LED lamp: piranha LED , small straw hat and SMD. Three package types LED, light-emitting principle is the same in fact, both use a blue light emitting chip, filled with yellow fluorescent powder, blue light by refraction and internal mixing phosphors to produce white light, the external use of epoxy resin, resin have protective chip and prism effect, the angle of the light emitted can be a control.Because the light emitting principle is same, but the brightness is different, to compared the three kind of led. The piranha LED most brightness, in turn is led straw hat and last is SMD. which is the difference between SMD and led straw and brightness.Now To have a practical understanding of the three kinds of LED on the led market with the most.

Fig. 1 piranha LED

Fig. 1 show as  piranha LED  Piranha LED package is one of the largest in this three types. square, has four legs,is one of the three best package heat dissipation capability.The LED heat through the internal structure(distribution outward from jointing pin) of its own. Piranha LED as bigger in size, the thermal conductivity of metal inside it big, and he has four legs(jointing pin), It is because the Piranha LED has better ability of heat dissipation, his work current of LED is slightly higher than the other two, can reach more than 30mA, while the small straw hat with the normal operating current SMD is about 20mA.In addition,Piranha LED package size is relatively large, it can be integrated in a small reflector inside the package, which is to improve the brightness of Piranha LED is also very good, so the Piranha LED is three packages in a single brightness highest. Another look at a small straw hat (Figure 2) small straw hat LED is circular, looks like a straw hat.

       
Figure 2                                               Figure 3

is a small straw hat and a Piranha LED put together photographs, the photos can be seen that small straw hat size is much smaller than the
Piranha LED , no structure reflecting cover, and only two legs(jointing pin), from the structure, thermal performance worse than the Piranha LED , so the small straw working current is lower than the Piranha LED , generally work at about 20mA, so its service life is greatly reduced.Finally, take a look at SMD, SMD is the abbreviation of Surface Mounted Devices, meaning the surface mount device, SMD does not mean a particular LED，it’s just the form of a package, a variety of surface mount components can be called SMD, such as SMD resistors, SMD capacitor, SMD manifold, etc.so the SMD is just a collectively. the same is There are a variety of differences between LED SMD package, for example,such as 0805, 1206, 1210 etc.. So some people say that SMD is a substitute of LED in the future,such a thing is very problematic, because the SMD is just a collectively, how to replace?And now we generally think of the 1210 package

( Figure 4 –some people also known as 3528 to 1210) namely SMD LED, the Piranha LED , a small straw hat with SMD 1210  put together photos.we can see, the SMD LED package size is even smaller than the small straw hat. The greatest advantage of SMD LED package — its small package size in the modern electronic products become smaller, the internal space more and more small, the small size of the components is very competitive. because of its small size,SMD LED because of its small size, meanwhile welding after it is structure of a fully attached to circuit board, so the cooling performance is the worst than the other two, the SMD LED without resin lens, it’s brightness is much lower than the Piranha LED and small straw hat. but then (again), because of the so-called SMD, refers to surface-mount devices, as long as the surface mount, called SMD, so strictly speaking, there are more bright SMD LED, is 1W, 3W or 5W high power SMD LED, shown that some 1W or 3W high power LED as shown in Figure 5 is 1W or 3W power LED , because they are surface-mount packages, so they can be called SMD.

Figure 5

In the above description, we have repeatedly mentioned in one word: radiationPerhaps some people will ask, LED is not known as the cold light source? Not to say that LED does not heat it? We used to have customers get our products after asking us, how does it feels a little hot an open lamp. In fact, When the situation described by the if clause is not presupposed to be false, electronic products all work to be hot, single bright, you might not feel too much heat, but when many LED together, operating at the same time, it comes out of the heat is quite impressive. but relative to the incandescent light bulbs, his fever is much smaller. In the design of LED lighting, heat dissipation design is a very important,because all the LED has a bad light Luminous Flux Depreciation,  Luminous Flux Depreciation with LED working temperature is great relationship. so our products in the design of circuit boards, will pay much attention to the heat problem.

LED LIGHTING DRIVER IC(LPD6803) INTRODUCTION

LED as the display, due to its advantages of high luminous efficiency, long service life, easy to control.has increasingly been used in more fields Especially in now began to be widely used in the lighting system of city / stage。This paper describes the types of LED lights, LED lighting control dedicated chips, the hardware and software design ideas design ideas .Color image point: in order to make the LED light color display is required by at least two or more different LED colors form a LED pixelｓ. RGB LED collocation according to the brightness and gray level demand can have a variety of combinations, such as: 1 pcs red LED + 1 pcs green LED+1 pcs blue LED can be display 256 gray color. The LPD6803 is specially designed for LED lighting system driver chip, built-in-PWM, can generate three-way constant current driving and gray adjust output.

Technical features:The multi- color pixel dot composed of led tube. each pixel changes can be independently produced 256 color.

Application environment: overpass, river fence, decorative lighting of building exterior wall in different places.Multi-color pixel dot compose of a module. Can be independent controlled of echo pixel dot.

Application environment: bar, KTV, stage. As decorative lighting floor or walls.LED lighting control chip introduced LPD6803 is designed for LED lighting driver chip, simple control.

Function description:

The built-inA. oscillator,The scan does not need that the control board to provide scan clock.The B. two control lines, control and simple wiring.C. data clock can reach 25MHz, you can get more cascaded output.LED lighting control system hardware design ideas

LED lighting control system mainly consists of the pixel drive unit and control panel designed in two parts.

The 1 display unit design of the driving point How to achieve the pixels showing a different color, mainly rely on the principle of human visual intermittent inert,using each pixel to produce different duty cycle for the mixing of colors. The design of LED color display case mainly depends on the LPD6803 automatic output 3 channel 256 gray color to achieve color display. The controller only needs to transmit each pixel scanning duty cycle data .
The drive unit design diagram below, suitable for color LED guardrail tube, LED floor tile applications.
the number of red, green and blue three-color LED can be multiple. Single LED cascade mode can be used in series or parallel way to achieve, in the design is you need to The hardware is only provided the design of a control system for your reference, To be sufficient some basic conditions needed for an ordinary LED lighting system.According to the actual system, can choose ARM, CPLD, accelerate the speed of transmission data and USB communication, SD card storage requirements.Hardware design of objective description(consider the voltage / current and external drive. Data output cascade connect to the next module input will achieve a cascade system.

  Hardware design of objective description

U1: use MCU51 microcontroller, if the system drive pixel cascade number not much and don’t need to do image animation too complex display case. The MCU even can choose 2051 pin low, low price of MCU.
JP1: with LPD6803 serial sequence interface for output, only DATA, CLOCK, GND can meet the requirements of data transmission.
U4: SPI FLASH, for storing program data. According to the need of the system can be used to design multi chip FLASH memory chip. SPI FLASH now relatively high capacity can be done 4M bits.
U6: as the communication interface, used to show content and transmitting program data system host communication control. And for the upgrade program.
Driven design software 3

The following to drive the individual pixels to illustrate the data transfer mode. lpd6803 led strip is an automatically generated 128 level!