There 68 true watt cfls btw 300 watt equivalent.. So look at it like a 68 watt bulb and make sure you keep them close if you want nice buds! Its better to mix up the spectrum with cfl's when it comes to flowering too, good luck..Damn I was out of internet for a while. Thanks for the help. I have 4 100w 2700k for the blue spectrum and the 300w cfl is still in there to provide those extra lumens. Once I switch to flowering I will be adding 2 more 300w CFLs.