Well, I decided on the Aquaspacelight 3x250W w/4x24W PC actinics. It arrived on Thursday and "big surprise" it was dropped enroute,
presumably by UPS. And one of the glass UV filters shattered. I spent most of Saturday taking the fixture apart and vaccuuming out the shattered glass. When I had it apart I noticed that two of the ballasts had broken completely free from their mounts, one MH and one PC balast. I remounted them, then I realized that the unit did not have any fans installed in it.
I thought I remembered someone saying that they had a built-in fan.
Did I get a new model? old model?
Did they ever have fans?
Do you think that there will be any heat issues without internal air circulation?
There are three vents on the top of the fixture, one over each MH bulb. And the ends of the fixtures are vented as well. THe MH ballasts are mounted at the ends of the fixture right beside the vents.
Thanks again,
Frank

I thought I remembered someone saying that they had a built-in fan.
Did I get a new model? old model?
Did they ever have fans?
Do you think that there will be any heat issues without internal air circulation?
There are three vents on the top of the fixture, one over each MH bulb. And the ends of the fixtures are vented as well. THe MH ballasts are mounted at the ends of the fixture right beside the vents.
Thanks again,
Frank