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Many indoor gardeners recommend metal halide lights above all others. The reason being
it's excellent spectral distribution. Metal halide bulbs emulate bright summer
sunlight and contain all the energy peaks at wavelengths of the visible
spectrum.
 MH lamps have
good lumen maintenance so that as a lamp ages the decline in lumen output is
very gradual. After 12 months of use at 18 hours per day, a 1000 watt metal
halide lamp should be replaced as it is only about 85% as bright as the day you
bought it. Metal halide is the best bulb technology available for achieving the
highest level of plant and flower growth.
Large scale gardener? Save money buying
bulbs by the case!
Find recycling information at
LampRecycle.org.
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