When using artificial light sources, we must choose the natural light closest to satisfying the conditions of plant photosynthesis. The light source should have the following characteristics:
1. Highly efficient conversion of electrical energy into radiant energy
2. Achieve high radiation intensity within the effective range of photosynthesis, especially low infrared radiation (heat radiation)
3. The emission spectrum of the bulb meets the physiological requirements of plants, especially in the effective spectral region of photosynthesis.
Among the various artificial light sources with a comparative intensity in the effective region of photosynthesis and horizontal radiation, the energy conversion effect of the sodium lamp is twice as high as that of the mercury lamp. Sodium lamp is the most effective light source to influence photosynthesis and correct growth of plants in the greenhouse. Tubular sodium lamp can reach 150lm/w high luminous efficiency radiation, which is currently the most favorable choice for the growth of various crops. Increasing the sodium vapor pressure in the ceramic arc tube can expand the spectrum of blue and red light, which is the high-range wavelength that is being pursued. Among high-pressure sodium lamps for applications and gardening products, we recommend PLANTASTAR (OSRAM), SON-T AGRO (PHILIPS), LUCALOX XO (GE). The difference between them is to increase the 0-40% blue light range and activate the plant's chlorophyll. In order to obtain the highest radiant energy, all sodium lamps are equipped with a reflective layer inside the lampshade. At present, most domestic factories generally use sodium lamps as street lamps for plants on the spot, and export them, causing a lot of losses to the majority of users.
Principle
Light environment is one of the important physical environmental factors that are indispensable for plant growth and development. Controlling plant morphology through light quality regulation is an important technology in the field of facility cultivation.
