Interpretation of LED light source and its characteristics in greenhouse

Ordinary fluorescent lamps provide more green light, about 50%, and most of the rest are red and blue, which account for about 25% of the total spectrum, and the far red spectrum is very low. Led drive circuit fluorescent lamp has high luminous efficiency and long life (about 12000h), but the power is small (currently 28W and 36W are commonly used), and many lamps are needed to meet certain illuminance. Because it contains a lot of green light, it is easy to cause crops to grow. Currently used in plant tissue culture.

A metal halide lamp is a gas illuminating light source in which a mixed vapor of mercury and a rare metal halide generates an electric arc to discharge light. The switching power supply design can display different spectra by changing the metal halide composition, which has higher luminous efficiency, high power and long life (5000h~20000h). However, there is mercury in the filler in the lamp, which will pollute the environment when the lamp used is broken or discarded. The spectrum contains a lot of far red light, which generates a large amount of heat and cannot illuminate the crop at close range.

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