Phaydra thank you for linking it! It shows that more people are finding the Finnex fixtures which are really good! And thanks Starrlamia for trying to stop the watts per gallon rule. Truth is it doesn't work unless everyone uses the same fixture same height from the substrate and same bulbs. Please stop saying "3 watts per gallon is ___ amount of light." A 15 watt T5 is like 3x more powerful than a 15 watt T8, so how does 3 watts of T5 equal the same amount as T8?
For the Finnex fixtures there are two different ones. There is the fugeray and the Ray 2, the Ray 2 is more powerful, but use this PAR chart to find the one that you need. http://www.plantedtank.net/forums/sh...d.php?t=189944
Also reference the chart Starrlamia posted for fluorescent bulbs.