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Currently, my 46 gallon tank is lighted by two 6700k T5HO's and one purplish T8 bulb. What spectrum of light will help red plants grow the best? Which brand of T8 light bulb will bring out the colors of the red plants more?
 

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I have never seen a reason to believe that reddish plants require any different light spectra than pure green plants require. But, you can't see much reflected red colored light when there is no red in the light spectra, so bulbs that give some pink or purple color in their light make the red in the plants stand out better. You may already have about as good a selection of bulbs as you can get.
 
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