Light-emitting diode cold and hot light source difference
Release time
2022-11-28
Light emitting diode how to distinguish between cold light source and thermal light source, we can not only from the definition to distinguish. In fact, what we call cold light source does not mean that the process of LED light-emitting beads do not produce heat, but refers to the way LED light-emitting beads are not converted from thermal energy to light energy. Incandescent lamp is the process of converting electrical energy into heat energy, and then heat energy into light energy. Heat energy loss is high, luminous efficiency is low, in accordance with the development trend of LED white light; LED lamp beads white light we can regard it as a cold light source.
Cold light source: cold light source is the use of chemical energy, electrical energy, biological energy to excite the light source (fireflies, neon, LED, etc.). Has a very good optical, variable flash characteristics. Object luminescence, its temperature is not higher than the ambient temperature, this luminescence is called a cold light source, such as LED lamp beads is the use of electron-hole pair compound luminescence. In a strict sense, LED light beads are electroluminescent also have heat generation, but relatively low compared to incandescent and other light sources. LED light beads electro-optical conversion efficiency of about 30%, including internal quantum efficiency of about 70% (close to the theoretical limit), external quantum efficiency of about 50%. (This is only experimental data, and not the exact value)
Thermal light source: the use of thermal excitation of light sources, such as incandescent lamps at 3,000-4,000K temperature thermal radiation luminescence. Incandescent lamps have 80-90% of the energy converted to thermal energy, about 10% of the energy converted to light energy. Therefore, the luminous efficiency is low. We are not based on the temperature of the lamp housing to do conclusions cold light source, or hot light source. The temperature around the lamp is high or low, only to judge the merits of the lamps and lanterns heat dissipation measures.
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