I tried eggcrate. I have one halide centered in my tank with the eggcrate the ends of my tank were completely dark. All of the light is blocked with the eggcrate (after all, it does force light to be directional). This would be less of an issue with fluorescent bulbs, but still some light is blocked.
But the par would not be more with eggcrate since the eggcrate just blocks (absorbs) the angled light, it doesn't redirect it straight down.
There is no noticable difference between "with screen" and "no screen" in terms of brightness of the tank (as seen by the naked eye, anyway).
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Current Tank Info: 45 gallon rimless cube - Vortech MP10ES Neptune Apex Controller - Kessil 360w - Tunze Osmolator
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