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I use the Lights of Americas 6500k ones shaped like the bright bulb and I think it puts out more light because of the U shaped glass. I think the spiral design spreads the light around more. I'm not an expert, but I have read much about the U shaped bulbs being more efficient for planted tank purposes.
 

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Discussion Starter · #3 ·
thaxs for the info i been using 4x15w bright bulb for a year now and the plants grow very fast, guess ill stick with the U bulbs.
 
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