Bill,
Be careful with those multiple halogen lamps. They are still primarily room heaters and put out amazingly little useful light per Watt.
In addition, the last set I got had a little transformer-like box between lamps and wall plug. It wasn't a simple transformer, but an electronic step-down regulator that blasted electrical noise into the air (jammed nearby AM radios) and back into the power line (totally messed up my BSR X-10 controllers).
CFs are so cheap and available that I don't see any need for putting up with halogen lamps around aquaria. Huntsville may be a lot cooler than Bishop, but still it isn't nice to not see fish on a summer evening. [My rough estimate is that one 20W halogen will add about as much heat as three deBruyn filters will remove. ;-)]
BTW, some of the cheaper CFs with screw base are also electrically pretty noisy, and the trickle current used to allow them to sense it and turn on manually when you operate a line switch could make enough noise that my X-10 systems would sometimes turn on all the aquarium lights in the middle of the night. Use a portable AM radio to walk around and find and replace the guilty party.
I like best the single u-tube lamps in 7-13W, in a good AH Supply reflector, operating off a remote magnetic ballast in the line cord. One 9 Watter will easily give as much light as the three halogens, with about 1/8 as much heat.
Wright
01 760 872-3995
805 Valley West Circle
Bishop, CA 93514 USA
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