I have heard they are useless. I wouldnt bother.

Peace
Charbud Reviewed by Charbud on . BLUE CFL'S So this question pertains to using those blue party bulb cfl's as a suplimental lighting during flowering i read that uv-b has positive results it's just curiosity i want to add a uv-b bulb already but blue bulbs are just really blue has anyone had this thought? Rating: 5