05-29-2011, 04:21 PM
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Originally Posted by excal88
By screen do you mean fiberglass screen? Or just any screen? Currently my light has a acrylic splash guard, and then my tank has a acrylic cover. The light is 2-3 inches from the top of the tank. I'll see if I can get some things to prop it up to get it 4-5 inches up. But just wondering if my 2 acrylic sheets mentioned would act as a screen. Thanks!
I think the acrylic will block any UV from the lights, but the fiberglass/plastic window screen material (could use aluminum screen, I suppose) acts like a shade cloth, physically blocking the other light wavelengths. You could always just lay a layer of screen onto the acrylic tank cover between the light and the water. That would reduce it, but still not enough if you use both T5HO tubes at once without raising the fixture. The current planted tank "consensus" from my readings seems to be moving to less light (light as the limiting factor) to reduce the issues of algae and, to some extent, make it easier on the fish - who generally don't appreciate super-bright lights.
Be very careful propping up your light fixture, if you do that, make certain it's solid. One good bump, it's in the tank, and you could get quite a shock
, as well as ruin the fixture!
The environmental downside of running two bulbs, just for color balance, is it takes twice as much electricity...