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A grow light or vegetable light can be an artificial source of light, generally a power light, made to stimulate plant expansion by emitting an electromagnetic variety befitting photosynthesis. Grow equipment and lighting are being used in applications where there is either no in a natural way developing light, or where supplemental light is necessary. For instance, in the wintertime a few months when the available time of daylight may be inadequate for the required plant growth, lamps are being used to extend enough time the crops receive light. If plant life do not acquire enough light, they’ll expand long and spindly.
Grow lamps either try to give a light range similar compared to that of sunlight, or to give a range that is more personalized to the needs of the vegetation being cultivated. Outdoor conditions are mimicked with differing colour, temperature ranges and spectral outputs from the grow light, as well as differing the lumen end result (depth) of the lights. Depending on the sort of vegetable being cultivated, the level of cultivation (e.g. the germination/vegetative period or the flowering/fruiting stage), and the photoperiod required by the vegetation, specific amounts of variety, luminous efficiency and colour temp are advisable for use with specific vegetation and schedules.
Russian botanist Andrei Famintsyn was the first ever to use man-made light for place growing and research (1868).

see more at wikipedia

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