Plant growth lamp is an artificial light source, usually electric light source, which aims to stimulate plant growth by emitting electromagnetic spectrum suitable for photosynthesis. Plant lamps are used in applications where there is no natural light or where supplementary light is required. For example, in winter, when the possible sunlight time may not be enough to achieve the required plant growth, the lamp is used to extend the time that the plant receives the light. If plants don't get enough light, they will grow in vain.
Growing lights either try to provide a spectrum similar to that of the sun, or provide a spectrum more suitable for the needs of the cultivated plants.
Simulate outdoor conditions for different colors, temperatures, and spectral outputs from the growth lamp, as well as changing the lumen output (intensity) of the lamp. According to the species of cultivated plants, the cultivation stage (such as germination / nutrition stage or flowering / fruiting stage), the light period required by the plants, the specific range of spectrum, luminous efficiency and color temperature are all desirable specific plants and time periods.
Plant lamps are used for indoor gardening, plant propagation and food production, including indoor water plants and aquatic plants. Although most plant lamps are used in industry, they can also be used in families.
According to the anti square law, the intensity of the light radiated by the point source (in this case, the bulb) reaching the surface is inversely proportional to the square of the distance from the surface to the source (if a pair of images is twice as far away, it only receives one quarter of the light). This is a serious obstacle for indoor growers, and many technologies are used to use the light as efficiently as possible. As a result, reflectors are often used for lighting to maximize light efficiency. Lamps or lamps move as close as possible so that they have the same illumination and all light from the lamp falls on the plant rather than the surrounding area.