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Re: GE Halogens

Bob Dixon wrote;
> While at the grocery store today I saw a 500-watt halogen bulb, made
by GE that was about 4 1/2 inches long and less than 1/2 inch across. 
What's up with that?
Halogen lamps are a very poor choice for aquarium lighting.  They are
incandescent lamps that operate with a higher filament temperatures
than standard incandescent lamps.  While this improves the efficiency
somewhat they still fall far short of fluorescent lamps.  You could
achieve similar light output using (4) 40 watt fluorescent lamps. 
Assuming you have your lights on 12hrs/day and pay $.08/kwh it will
cost you about $120/year more to run the halogen lamp.

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