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RE: MHD Lights
Alfred Heng asked how much heat MHD lights generate.
I have two 150w 6500K MHD lights suspended 12 inches over my 100 gallon
acrylic aquarium. The lights are on ten hours per day. The tank is kept in
an air conditioned room where the air temperature is a constant 71 degrees.
In the morning, before the lights come on, the tank temperature is 78 degrees
F. At the end of the day, when the lights go out, the tank temperature is 81
degrees F. MHD generate a lot of heat - just stick your hand directly under
one and also around the unit as heat is radiated in all directions. However,
if you didn't use MHD your next best choice for efficiency (high light output
compared to low heat output) would be T-8 fluorescents. Eight T-8s take up a
lot of space and also generate a lot of heat. If space is a problem,
consider the new compact fluorescents.
San Diego, California