You won't loose much light at all. Here's my tank with egg crate covering it with the same light set up that you have. I still need to trim one of the pieces so it sits flush with the lip of the tank.

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You know, come to think of it, I'm not afraid of ants. I never was. It's just when they all come running out of a lady's pants like that... yech, creepy. And isn't sanity really just a one-trick pony anyway? I mean all you get is one trick, rational thinking, but when you're good and crazy, ooh ooh ooh, the sky is the limit! - The Tick
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