According to the law of conservation of energy, LED lens light heats up because electrical energy is converted into When light energy is not 100% converted into light energy, but a part of it is converted into heat energy, and the electro-optical conversion efficiency is about 20~30%. That is to say, about 70% of the electrical energy is turned into heat energy.

Specifically, the junction temperature of the LED lens lamp is due to two factors caused:

LED lens light has low internal quantum efficiency, that is, the recombination of electrons and holes When 100% photons are not generated, it is often referred to as "current leakage", which reduces the recombination rate of carriers in the PN region. The leakage current multiplied by the voltage is the power of this part, which is converted into heat energy, but this part does not account for the main component, because the internal photon efficiency is now close to 90%.

LED lens The photons generated inside the lamp cannot all be emitted outside the chip and finally converted into Heat, this part is the main one, because at present this so-called external quantum efficiency is only about 30%, and most of it is converted into heat.

As mentioned above, although the light efficiency of incandescent lamps is very low, only about 151m/W, but it converts almost all the electrical energy into light energy and radiates it out, because most of the radiant energy is infrared, so the light efficiency is very low. , but avoids the problem of heat dissipation. This is the difference between LED lens lamps and incandescent lamps.