Are you growing low light or high light plants? Pressurized CO2?Would this fixture need to be suspended over the tank or would it be able to sit right ontop of a 55g with glass top?
Yeah ... I wouldn't go with the white painted shop light .. for the little extra money I'd get the Diamond Plate at HD. It's a bit more versatile. If you decide to go higher light you might not have to buy another fixture. If the light is too much for your needs, you can raise the fixture or use window screen to block it some.If you do do the shoplites check out Walmart where you can get them for less than $20.00 each.
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Assuming it's 16" tall and 2" substrate, sitting right on the glass it would put the light at about 14", so according to the chart it would be approximately 78-80 PAR.So with 6500k t8 bulbs in that fixture on the glass what do you have? Medium light or high? Say on a 40 breeder