I use those PC eco lights in my sump. They look like crap, but algae loves them. I actually wondered that too reg. halogen bulbs. You can get a 200 watt bulb IN a fixture for really really cheap. They run really hot, but still, with all that light - it may be worth it. Has anyone used halogen lights in a sump, heck, anyone used them in a display tank with actinics. Realistically, you could have 20 - 30 of the tubes on a 55 gal tank, and you would still have room (and money) to have 4 X 96 watt PC actinic bulbs. Any thoughs on this? I know there are a lot of light guru's (Ahem, Bob_I, Harvey, Dez...) out there who have already though of this, so why didn't you go this route?
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