Ir led and 38KHZ carrier frequencyThe carrier frequency of ir led is 38kHZ.the 38khz is familiar to us.Why ir led had only taken 38kHZ?
the principle is : carrier frequency at 30khz to 60khz.but the 38khz for almost applications. This is due to translate with 455kHz crystal . the 455kHz crystal can output an integer number for ir led . Frequency Division Factor to 12 . like this 455kHz÷12≈37.9kHz≈38kHz.
But that was in the past, at moment Except 38KHZ， there are have 26 kHz、36 kHz、40 kHz、56 kHz、80 kHz of ir receiver in led market . the single frequency receiver is fastened to specifies frequency. For example the 38khz receiver just only decoding 38khz, the 56khz receiver just only decoding 56khz. With the exception of fixed frequency receiver .there are have wideband receiver(also call variable-frequency or full-frequency).the wideband receiver holds only within certain limitations. which shown that it have stronger function and wider application area.

As we know stop a vehicle by applying the brake , then brake lamp is lit.. the instruct lamp is importance part for car brake system . the brake lamp on the right and left sides. It’s red led. Red color represent warning and instruct. The signal warned the public to be vigilant and report that the car running into brake system. Other carts that gained signal slowed the car or stop car . Prepare a solution ahead of time.
we could make a brake lamp with fog lamp. Or used as LED for brake.

Talk about 395nm and 365nm
The 395nm and 365nm represent in wavelength of uv led strip. The shorter led wavelength , the visual will dim .we makes a test that the light of 395nm and 365nm get into white paper at time, the 395nm more lumen than 365nm on white paper.
Optical speed almost same. So the frequency being inversely proportional to light wave length. The shorter led wavelength has better penetrating power（Photons have no mass， but base on theory of photons , the bigger frequency and the shorter wavelength ,the bigger power）.

Now, makes a example for you refer X-ray is widely used in industrial non-destructive testing and medical perspective inspection because of its strong penetrability.

Efficiency of led wavelength
The led is not simply lighting product, it was new lionized by scientific researcher .

It is essential that to review this know point. The follow is difference led wavelength.
Ultraviolet: uv led strip make ultraviolet , the scale of wavelength as 311nm～400nm，wave width as 20nm～30nm，wave power as 6mW～300mW ,UVA can be used to treat the Skin diseases such as psoriasis, also can using in Beauty and sterilization

Infrared: infrared applies to make infrared production(device) and user can using ir led(wavelength in 780nm～1200nm) , in the wavelength can be used to that Anti-inflammatory and Analgesic , and helps to enhance metabolism and strengthen immunity.

Blue light: the led source with 425nm～475nm can curing can be used to treat the Neonatal jaundice .

And with wavelength in 446nm～477nm to adjust The pineal gland amine hormone secretion of melanin to promote the brain tissue.

Red light: The red light has wide application ,it can applies in the effects of light on chemical systems. It should speed up the synthesis of cell and to promote that wound recovery.
violet

Mixture light and white light: there were several different wavelength are encapsulated inside the shell . different wavelength   can meet the various needs of Treatment.