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If someone hasn't said Taotronics, those are the LEDs that have become quite popular. Supposedly grow everything and are very cheap. If you get them, make sure to buy the dimmable version. If you're buying any LED fixture, you'll want it to be dimmable. I have T5 HO bulbs (Sunlight Supply) which are too strong on my tank and grow almost anything, but on a corner tank, LED might be better.