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Lamps commonly used light sources and characteristics
- Feb 28, 2017 -

Commonly used light sources are fluorescent lamps, high pressure sodium, low pressure sodium lamps, metal halide lamps, and so on. In recent years, with successful development of high-power LED, new energy-saving LED light source has caused wide public concern.

Ordinary fluorescent lamps provide a lot of green light, is about 50%, and the rest are mostly red, blue, and each accounted for 25% of the total spectrum of far red light spectrum was very low. Fluorescent high luminous efficiency and long life (12000h), but less power (28W and 36W two currently popular), you need to meet certain illumination lamps. Because it contains a lot of green light, likely to cause crop leggy. Commonly used in plant tissue culture.

Metal halide lamps are mercury and metal halide vapor mixture produced arc discharge luminescence of gas lighting. By changing the metal halide different spectra. Its high luminous efficiency, greater power, long life (5000h~20000h). But have mercury fillings in the light, when you use the lamp is broken or abandoned, will pollute the environment. Spectra will contain more far red light heat not brachytherapy crops.

LED (light emitting diode) light is a newly developed new energy-saving light sources. And compared to the artificial light sources such as incandescent, fluorescent and high-pressure sodium lamps, LED with remarkable advantages:

• DC low voltage power supply. Low-power color LED forward voltage is typically a 1.5V-2.8V, high power LED forward voltage is typically a 3V-4V, much less than the safe voltage.

• Energy saving. Sodium lamp and metal halide lamp is a gas discharge light emitting lamp, glow, but by heating the metal vapor discharge. LED is solid luminous light, don't need heat to light, is a cold light source, thus reducing the consumption of electricity in the heating.

• Monochromatic light, high luminous efficiency. LED emitting monochromatic light, half-bandwidths are 20nm, can be used to provide plants with the spectrum needed without wasting energy issue yellow light, green light spectrum of the plant does not need.

• Small size, flexible application. Lamps that can be designed, thinness, and applications in space.

• Environmental protection. LED is solid luminous light, does not contain harmful substances such as mercury, in installation does not cause pollution, the waste can be recycled. The green light of the LED light is green.

• Long service life. LED is solid light source, there are no loose parts, no glass, filaments and other fragile and vulnerable burned parts, mechanical strength, resistance to vibration and impact resistance, life up to more than 50000h.

Advantages of LED light sources have caused the Netherlands, Japan, the United States and other countries the attention of scholars, especially in recent years, successfully developed for high power LED, laid the groundwork for LED light in the greenhouse.