For vegative growth 5500k-6500k is best. For flowering 2700k-3000k is best.

The blue blub may be fine for rooting cuttings or starting seedlings. I use an actinic white (very blue) for that.
oldmac Reviewed by oldmac on . T5 Temps 10000K 24W vs B+ Which bulbs for T5 are best? I have a few 10000Ks and a couple Blue B+ bulbs. 24" at 24W any help would be grrrreeat. Rating: 5