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Either is fine, though the 5500 may look more natural. Color rendering is deffined by a seperate index from color tempreture. I belive the higher the CRI the better (someone correct me if I am wrong). However, all the indexs that you see commonly listed on a bulb (output in Lumens, CRI, color temp.) are pretty much aesthetic issues of how the bulb makes things look and are not very good guides as to what is optimal for plant growth.

What you want idealy is a bulb which produces the bulk of its light at around 400 nm and 680nm wavelength. Or something a little less then 2000 PPFD. But good luck finding a bulb that has either of those listed in its specs.

Your best option is just to play around untill you find something that looks good to you and figure at least 2 watts per gallon (that however is only a crude guide).
 
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