Quote Originally Posted by Somasmoker
I'm going to put up 4 cfl grow light, each of them works as 500W MH

peesout

HUH?

FUll Spectrum CFL's have a temp of 5500k - 6500k

MH bulbs have a temp of 4000K.

The difference is in lumen output.

If you get 4 CFL you have more blue light but you wont have near the lumens of 4 MH.