LED light-emitting principle for the
semiconductor material between the electron-hole combination.
Characteristics of light waves generated by the material energy gap of
decisions, and a single LED chip, using the same self-luminous
material, so the light source spectrum, with a narrow bandwidth
characteristics, the average spectrum of half-intensity width (Full
Width at Half Maximum), is about In the 20nm or so. The traditional
general light source, light-emitting principle of heat radiation, so he
sent the energy of a more continuous, but with a continuous
distribution of the spectrum, or fluorescent lamps (Fluorescent) and
high-pressure gas discharge lamp lighting system (High Intensity
Discharge), such as mercury lamp ( mercury vapor, MV), Metal Halide
Light (metal halide, MH) and high-pressure sodium lamp (high pressure
sodium, HPS) and so has a wide light spectrum is not continuous
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