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 technologies and equipment

Lighting systems

   Supplemental lighting is used in greenhouses to increase crop production during time periods with low levels of solar radiation. ... Thus, if crop production is on a tight schedule, supplemental lighting may be required year-round.


   Fruit-bearing crops and flowers need more light than root vegetables and greens.


   The most efficient lamps used for supplemental lighting in greenhouses are the so-called high intensity discharge (HID) lamps. Metal halide (MH) lamps produce a more white-colored light, while high-pressure sodium (HPS) lamp light is more yellowish orange. MH lamps produce a little more blue light that is important for the proper development of some crop species.