The tao units are great, unless you get a defective one. I had one less than a week, first the timer went, then an entire bank of leds stopped working. I went though months of crap with the company, only to have to resort to contacting amazon about it, then it was resolved. They are prone to noisy fans also. Much as I hate the company, they make a decent unit, with the occasional defect that they will replace, you Will have a hard time getting a refund though. Depending on height from tank, I think 4 units, they make a 212 watt unit also, it's 400 bucks, but you can fine the exact same for half that price, also on Amazon
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