Compared with traditional plant lamp, LED lamp has many advantages. LED lamp manufacturers are environmentally friendly and do not have harmful substances of mercury. The assembly parts of the LED bulb can be easily disassembled and assembled, and can be recovered by others without the need for manufacturer's recycling. No strobe. Pure DC operation eliminates the visual fatigue caused by stroboscopic light source. Reduce line loss, no pollution to power grid. Power factor (> 0.9), harmonic distortion (< 20%) and EMI meet the global target, which reduces the power loss of power supply lines and avoids high frequency interference pollution to power grid. Traditional artificial light sources generate excessive heat, such as LED auxiliary lighting and hydroponic systems, and air can be recycled. Redundant heat and moisture can be removed, and electrical energy can be effectively converted into effective photosynthetic radiation, and ultimately into plant matter. The results showed that the growth rate and photosynthetic rate of lettuce could be increased by more than 20% under LED illumination. Mixed wavelength LED light source can obviously promote the growth and development of spinach, radish and lettuce, and improve their morphological indicators. Bioaccumulation of sugar beet was the largest, betaine was the most obvious in hairy roots, and sugar and starch were the most in hairy roots.
LED lamp can affect the growth cycle of plants, and the specific wavelength of LED can affect the flowering time, quality and flowering time of plants. The semiconductor wafer of solar LED lamp consists of two parts, one is P-type semiconductor, in which holes dominate, the other is N-type semiconductor, in which electrons are the main part. But when the two semiconductors are connected, a P-N junction is formed between them. When the current acts on the chip through the wire, the electrons are pushed to the P region, where the electrons recombine with the holes and then emit energy in the form of photons, which is the principle of LED lamp luminescence. The wavelength of light, the color of light, is determined by the material that forms the P-N junction. The LED lamp is an electroluminescent semiconductor material chip. It is solidified on the bracket with silver glue or white glue, then connected with the chip and circuit board with silver or gold wire. It is sealed with epoxy resin around, which protects the inner core wire. Finally, the shell is installed, so the anti-seismic performance of the LED lamp is good. LED can directly emit red, yellow, blue, green, green, orange, purple, white light. Some wavelengths of LED can increase the number of buds and flowers, and some wavelengths of LED can reduce the response to flower formation, adjust the length of pedicels and flowering period, which is conducive to the production and sale of cut flowers. It can be seen that LED can regulate the flowering and subsequent growth of plants.