There is a link I was trying to find to a guy's tank in one of the Scandinavian countries that only uses T-5's and has some good information on it. His tank is spectacular by the way. Try searching (if you can get in) on RC. I have 6 T-5's as supplimental lighting on my 190 and like them so far - much better than the supplimental PC lighting I have on my 230. With a shallow tank you can probably get away with T5's.
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