I have a grow now that I started with 6 plants in one bucket, and two lights. 2 85 Watt Spiral CFLs, 4200 lumens each, one red spectrum, and one blue spectrum, or one high and one low kelvins.
After I let them get TWO MONTHS OLD, I moved two females to a new tank, and put 5 85 Watts over them, two blues and three reds, and over the one remaining female I have 2 red and two blue 85 Watt CFLS. At 7 weeks flowering, I added 4 42 watt bulbs, all red spectrum for Flowering.
I love the CFLS, I paid $29 each for the 85 watts and Reflectors, or $19 each for just the bulbs. I paid $10.68 for the 42 watts from Lowes.
Here are some recent pics at 7 and half weeks of flowering. Sunday was 8 weeks exactly of 12/12, but I did not take them yet, two of the big buds started growing wierd looking white side buds off of them and appear to be doubling in size. I am at about a third clear, 1/3 cloudy and 1/3 amber trichs today but I hate to harvst a bud increasing is size so fast, I have it surrounded by 3 bulbs at 3 inches distance. it's freaky looking.
With all my bulbs I do not get much heat at all, and the power bill did not increase any noticable amount.
Look:
https://www.rollitup.org/indoor-growing/12679-almost-7-weeks-flowering-54-a.html