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HOME > LED knowledge > LED basic knowledge > Interpretation of the greenhouse fill light commonly used LED light source

LED basic knowledge

Interpretation of the greenhouse fill light commonly used LED light source

Date：2012-09-15

At present, the common greenhouse artificial light light source fluorescent lamps, high pressure sodium, low pressure sodium, metal halide lamps. In recent years, with the success of the development of high-power LED, the new energy-saving LED light source also attracted widespread attention.

The ordinary fluorescent provided more green, about 50%, most of the rest of the red and blue, respectively, accounting for about 25% of the total spectrum, far-red spectral ratio is very low. Fluorescent lamp high luminous efficiency, long life (about 12000 h), but less power (currently used in both 28W and 36W), required to meet certain illumination lamps and more. Likely to cause crop because it contains a lot of green, leggy. Commonly used in plant tissue culture.

Sodium lamp, mercury and sodium vapor light gas light source is divided into two kinds of low pressure sodium lamp and high pressure sodium. Low pressure sodium appeared earlier, the sodium vapor pressure is not more than a few Pa, the emission spectrum is concentrated in the The 589nm light yellow, usually only be used with other light sources complexes. The luminous efficiency of up to 200lm / W, long life (about 9000h). High pressure sodium standard sodium vapor pressure of about 10kPa, more red-orange light and less blue-green light emission spectrum. Higher luminous efficiency, high power, long life (about 12000 h), used in the greenhouse fill light more. However, due to the high pressure sodium lamp heat source, high surface temperature, the heat can not brachytherapy crop.

The metal halide lamp of the generated electric arc and thus a gas discharge light emitting light source is a mercury and rare metal halide vapor mixture. Rendered by changing the metal halide composition different spectral luminous efficiency, high power, long life (5000h to 20000h). Mercury lamp filler, to use the lamp breakage or failure abandon will pollute the environment. Spectrum contains more far-red light, heat, and can not brachytherapy crops.

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