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75 Gallon Lights
I want to build 2 metal halide lamps for my 75 gallon tank. I have 2 coil core ballasts and am trying to choose the bulbs for them. What reasonably priced bulbs are the best? I have heard alot about the 20000k bulbs has anyone had good luck with them or am I better off doing something with 10000k and getting a seperate actinic bulb?
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