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GREENHOUSE LIGHTING

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1 GREENHOUSE LIGHTING Neil Mattson, Associate Professor and Floriculture Extension Specialist Cornell University, 134A Plant Science Building, Ithaca, NY 14853 email: phone: (607) 255-0621 3 ways to think about light Light quantity also referred to as light intensity, is the total amount of light supplied to the plant, which is then used for photosynthesis; up to a point the higher light quantity the more energy a plant can sequester in photosynthesis Light quality refers to the wavelengths of light supplied ( color of light), for example red light has wavelengths between about 630-700 nanometers, far red light is 705-740 nm, blue light is at 400-450 nm, and ultraviolet A is 315-400 nm.

Humans see green light most easily (peak at 550 nm) ... is a really large number, 6.02x1023 photons, a micromole (µmol) is one-millionth of ... Two factors are used to calculate lighting costs – the initial cost of the lamp (capital) cost and the operating (electrical) cost. The operating cost can be compared in terms of wall plug efficacy

  Cost, Green, Really

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