The "Watts per gallon" rule isn't really very helpful, given the wide variety of lighting tech out there today. Do the T5 bulbs have a reflector for each bulb, or one big reflector for both? If they're individual reflectors, you''ll be OK for lower light stuff like your GSP, button polyps, mushrooms and stuff like that. If it's one big reflector, I'd be a bit nervous. Knowing what you ultimately want to keep will give us a better idea of how well this light will suit. Oh, and yes, T5s with good reflectors will beat PCs any day.
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