Problem of Infrared emission

Customers   ask the question of ir led strips Two days ago.  record them all. as follow:
I use the ir led, the control current as 30mA, facing the rear and close to the receiving tube, receiving no response (receiving pipe the output voltage does not have any reaction). With a remote control for his launch had response, which is why?Infrared emission must be in 38K carrier? In addition take series of infrared emission will reduce lifetime of the infrared transmitting tube, right?
In order to avoid the interference of other infrared signals（There are infrared everywhere）, Their shocking conclusion: almost every practical infrared remote control equipment had carrier signal.radio remote control equipment is also the case.

So use ready-made set of remote control device, if the transmitted signal does not meet the communication requirements (such as carrier frequency), the receiving device will not respond. Mentionof the "38K reception" should be the receiving device (receiver)only interested （work）in 38K carrier.the emission of infrared frequency hasn't been modulate of 38K carrier,the receiver device certainly can't work.Otherwise, the receiving device is not ideal that about anti-jamming capability,
the Carrier frequency does not necessarily is 38K, a lot of remote control using a 455K modulation,when you open the cover of TV remote control which you can see the 455K ceramic filter, which is the remote control of the carrier frequency.