Here you go, straight from the reef world's chemistry expert.
http://web.archive.org/web/20021206232224/reefkeeping.com/issues/2002-04/rhf/feature/index.htm
Re: Light Friendly Clear Mesh Screen Cover for Open Top Tanks-Standard/Rimless-w/Pict
PM Dave and see if he has any clear mesh left. I bought some from him and made a top for my 120g, works perfectly and good pricing. Thanks Dave!
I guess the good thing is that it's the lights you're experimenting with and not something like your ATO or kalk. If it doesn't work no harm done. Keep us posted.
Have you contacted LiveAquaria, they run a system with lights that move so they have no hotspots. They also run 400w. It might be worth a n e-mail to see exactly what they use.
That's even more fancy than what I had in mind. I do believe you'd be able to keep some corals with that. I saw a nano tank recently which had all blue LED's and his zoa's were growing good and colors looked amazing.