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I asked about this when I was thinking about upgrading last year and the consensus is that each light would light up about 2 feet so that you would have a foot leftover with low light if you use 2. Mine was a 6 foot tank and I couldn't justify getting 3 and having essentially 450 w of MH on it, since it was not a high light setup. For a 60" tank, you might be able to get away with using 2 if you have it a bit higher, but then you'd have a lot of shadows I think.
 

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my freind ordered some for a saltwater set up, I dont see why it wont work for a planted tank.... I am currently using the 36" 4 bulb t5 on my tank and it seems to be fine.

My opinion is they are a cheap light but well worth it!
 
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