Typical usage of grow lights
Plant lights are used in indoor gardening, plant propagation and food production, including indoor hydroponics and aquatic plants. While most grow lights are used in industry, they can also be used in the home.
According to the inverse square law, the intensity of light radiated by a point source (in this case a light bulb) reaching a surface is inversely proportional to the square of the distance from the surface to the source (if an object is twice as far away, it only receives four 1/1 of the light) This is a serious handicap for indoor growers, and many techniques are used to use light as efficiently as possible. Therefore, reflectors are often used in lighting to maximize light efficiency. Fixtures or fixtures are moved as close together as possible so that they have the same lighting and all light from the lamps falls on the plants and not the surrounding area.
Examples are incandescent lamps, fluorescent lamps, metal halide lamps (HIDs) and light emitting diodes (LEDs). Today, the most widely used lamps professionally are HID and fluorescent lamps. Indoor flower and vegetable growers typically use high pressure sodium (HPS/SON) and metal halide (MH) HID lamps, but fluorescent lamps and LEDs replace metal halides due to their efficiency and economy.
Metal halide lamps are often used in the vegetative phase of plant growth because they emit greater amounts of blue and ultraviolet radiation. With the introduction of ceramic metal halide lighting and full spectrum metal halide lighting, they are increasingly being used as exclusive light sources for the growth stage of vegetative reproduction. The blue spectrum may induce a greater nutritional response in plants.
High pressure sodium lamps are also used as a single light source throughout the vegetative and reproductive stages. Likewise, they can be used as corrections for full-spectrum lighting during reproductive stages. The red spectrum may trigger a greater flowering response in plants. Plants grow slightly faster if a high pressure sodium lamp is used as the vegetative period.
In recent years, LED indoor grow lights can produce specific wavelengths of light. NASA has already tested the efficiency of increasing space food on the space station. The results show that plants are affected by light in the red, green and blue parts of the visible spectrum
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