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High Intensity Discharge Lighting

High Intensity Discharge Lighting High Intensity Discharge lamps, or HID lamps, can be used to illuminate relatively large areas efficiently. Where winter months normally make plant growth difficult, the growing season can be extended indefinitely. Sizes vary from 70 to 6000 watts; a 1000 watt model will cover an 8 x 8' area with near-daylight intensity, for less than $1 per day.

Metal halide lamps give the best results, though more expensive than mercury vapour lamps. The colour corrected forms, HQI lamps, best reproduce daylight. Mercury vapour lamps have an irregular spectrum concentrated mainly in the blue, but can still produce good growth, at a cheaper cost. Both forms should be replaced every few years.

See also the sections on lighting and artificial light for more general information.

Topics Referenced

Artificial Light
On photosynthesis

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