What kind of cfl?

how can i tell if it is blue spectrum by looking at the box?

Click to expand...

Usually the box willsay Cool White, Daylight, Full spectrum, if they are in the vegg'in range.

Basically if the temperature is 4100 degrees or higher you are good.

Every question you have had about CFL's and more is answered in the CFL section, in one of the stickies. I highly recommend you check the cfl section out if you're looking to start a cfl grow.