Which light source is the real cold light source

‌ 1.Definition of cold light source and hot light source ‌ :

• Cold light source: the use of chemical energy, electric energy, biological energy excited light source, such as LED lights, glow sticks, fireflies, neon signs, etc ‌. Cold light sources in the process of luminescence, its temperature is not higher than the ambient temperature, or produce relatively little heat ‌.
• Thermal light source: the use of thermal energy excited light source, such as incandescent lamp, arc lamp, etc ‌. These light sources generate a lot of heat in the process of luminescence, and most of the energy is converted into heat, and only a small part is converted into light energy ‌.

‌ 2.Characteristics of LED light source as a cold light source ‌ :

• The luminous principle of LED light source is to emit light through the combination of electrons and holes in semiconductor materials. This luminous way has high energy conversion efficiency and relatively less heat ‌.
• LED light source in the process of luminescence, although the core part will produce a certain amount of heat, but on the whole, the temperature is not much higher than the ambient temperature, and through the appropriate heat dissipation design can ensure the stable work of the LED lamp ‌.
• LED light source has excellent optical performance and flicker characteristics, while almost no infrared spectrum, which is also an important feature of cold light ‌.

‌3.compared with thermal light source ‌ :

• Compared with thermal sources such as incandescent lamps, LED light sources are more efficient and can convert more electrical energy into light energy, rather than heat ‌.
• Incandescent and other thermal light sources will generate a lot of heat in the process of luminescence, resulting in a rise in the temperature of the lamp, and may even cause safety hazards such as fire. The LED light source as a cold light source, its safety is higher ‌.

4.led light is cold light source, what is hot light source

• Specifically, the thermal light source is a light source made by using the principle of light radiation generated by object heating, such as the sun, incandescent lamp, arc lamp, etc. ‌. The light they emit is often accompanied by obvious heat generation, giving people a sense of warmth. For example, sunlight is the most typical thermal light source, it provides us with light, but also brings warmth and heat; Incandescent lamp, on the other hand, heats the filament with an electric current to make it glow, which generates a lot of heat energy ‌.
• Unlike hot light sources, cold light sources generate less heat in the process of emitting light. Cold light source is the use of chemical energy, electrical energy or biological energy excited light source, such as LED lights, glow sticks, fireflies, neon lights, etc ‌. The light emitted by these light sources is mainly visible light, with a wavelength between 380 and 780 nanometers, and almost no infrared spectrum, so they are called cold light sources ‌. For example, LED lamps emit light through the interaction between electrons and holes, which has a high energy conversion efficiency and therefore produces less heat ‌.