Planted Tank VIP
Join Date: Jul 2002
Location: Winston-Salem, NC
I'm using that exact same All-Glass twin strip on my 55g to house a pair of Gro-Lux tubes. It does get hot, as mine sits directly on the glass as well. Tank temperature rises about 2 degrees above night-time temperatures, so it isn't too bad. And that is with a tightly sealed lid (gotta keep those Hatchets from jumping out!).
I don't use a fan with a single 4-F32T8 ballast driving each F40T12 tube 2x. When I tried putting all four outputs to one bulb, though, it got considerably hotter. Using a 2-F32T8 ballast actually underdrives the F40T12 tubes by a good bit since it was only designed to run two 32 watt tubes.
So give it a try with just one 4-F32T8 running each tube 2x, and you might not find that you need a fan. If you do, the silent computer fans with heat sinks definitely work. I'd just put it near the openings in the top of the strip, to push air out of the light strip. You'd need a small transformer to transform 120vac to 12vdc, though.
One additional point, though: with a single 4-F32T8 ballast overdriving a pari of four foot tubes (T12 or T8) 2x each, you won't quite be getting the equivalent of 160 watts. It would be closer to 120 watts. If you got a 4-F32T8 ballast for each bulb, you'd be getting the full doubling power and getting about 160 watts of output.
- Sam P -
plantedtanker in limbo - all tanks currently in storage