Incandescent lamp is a common light in daily life.The principle of luminescence is based on the phenomenon of thermal radiation luminescence caused by the current heating of the filament in vacuum or neutral gas to incandescence.Its advantages are simple structure, low cost, easy to use, good brightness.The disadvantage of high heating, low luminous efficiency;Short service life.
The halogen tungsten lamp is filled with inert gas containing halogen element (iodide) in the incandescent lamp body, and the principle of halogen tungsten cycle is used to improve the luminous intensity and service life.Disadvantages of poor shock resistance.
Fluorescent lamp, (fluorescent lamp energy-saving lamp) principle is to use mercury vapor to produce discharge in the effect of external voltage, emit a little visible light and big star ultraviolet light, ultraviolet light to stimulate the fluorescent powder coated on the inner wall of the lamp tube, make it emit light.The service life and brightness are superior to incandescent lamps.Disadvantages of long start time, there will be stroboscopic;Affect service life.
LED(light-emitting diode);Using solid semiconductor chip crop luminescent material, when the two ends of the positive voltage, the carrier fluid in the semiconductor compound, release excess energy and cause photon emission to produce visible light.Advantages: high efficiency, pure light color, low energy consumption;Long service life;Environmental protection, start immediately;Anti-vibration, cold light source;Long time lamp body surface heat is low, good heat dissipation.Get close to objects without worrying them.Based on this feature, LEDs can be placed horizontally or vertically over plants.Disadvantages of weak brightness, high cost.
The main reason is that the light plants need for photosynthesis is different from the light we use for everyday lighting.Photosynthesis is a process by which plants use the sun's light energy to assimilate carbon dioxide (CO2) and water (H2O) to make organic matter and release oxygen.Only LED lights can meet the above conditions, because only LED lights can emit the spectrum needed for plant growth. In order for plants to carry out appropriate light rays for photosynthesis, the spectral range is crucial to the influence of plant physiology.
In principle, plant lamps are basically a combination of red and blue, all blue and all red, to provide both red and blue wavelengths of light, covering the range of wavelengths needed for photosynthesis.Visually, the combination of red and blue plant lights appears pink.
LED plant light supplement lamp to plant light, the general power is lower than 50WLED plant light supplement lamp, for different plants, when used from the height of the main leaf of the plant is 0.2 ~ 0.8 meters is appropriate;Power is higher than 50WLED plant supplementary light lamp, for different plants, when used from the height of the main leaf of the plant is 0.5 ~ 1.5 meters;Combined with the above situation;LED lamp is suitable for plant filling light lamps.
