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This article is from the Aquaria: Plants FAQ, by multiple authors.

12 What's MH? Is it better than fluorescent?

Metal Halide (MH) lights are most commonly seen illuminating football
fields, but are also used in our hobby by reefkeepers and die-hard
plant enthusiasts, who demand very high light intensity. The fixtures
cost significantly more than fluorescent (over $200 per fixture). The
bulbs last longer and provide more efficient and brighter illumination
than fluorescents (typically 175-250 watts per bulb), but generate an
appropriately higher level of heat as well. Some aquarists like the
sun-like shadow effects generated by MH bulbs.

 

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aquaria, fish, acquarium, tank, plant, light, CO2, fertilizer