it all depends on what you want again... a 20k will look niceest. a 10k will make everything grow fastest. 14-15k is a nice balance. phoenix, Xm, radium are all good brands for metal hallide. and the bulbs are sold pre-rating. sometimes you just have to try one and see how it looks. for your T5HO get actinic which is above 20K, it dosent have a number just a name.
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