LED is a cold light source, why does it generate so much heat?

First of all, what is a cold light source? The so-called cold light source is a luminous light source that contains almost no infrared spectrum, which is different from a hot light source that contains an infrared spectrum. LED is a kind of cold light source, the light it emits is almost all visible light. Visible light has a wavelength of 380 to 780 nanometers and traditional incandescent lamps are heat sources. Then why does the LED heat up, because the electric energy of the LED light source is only about 30% converted into light energy, and the other energy is converted into heat energy, which must be transferred out by heat conduction. Therefore, LED lamps will generate heat. In traditional incandescent lamps, only 2-3% of the electrical energy is converted into light energy (visible light part), and much of the rest is radiated in the form of infrared rays. The characteristic of the cold light source is that almost all other energy is converted into visible light. There are very few other wavelengths of light, while the hot light source is different. In addition to visible light, there is a large amount of infrared light, and a considerable part of the energy is converted into no contribution to lighting. Infrared light. So the so-called cold light source is actually not cold. So why is it said that LED cold light sources are more energy-efficient than incandescent lamps? In fact, it means that the conversion of electrical energy into light energy is more efficient. Therefore, lighting manufacturers should pay great attention to heat dissipation when making LED lamps, because if the heat cannot be dissipated, it will affect the luminous efficiency of the chip. Therefore, generally LED lamps will have a radiator.