CFLs have the neat ability to be easilly swappable. Here is the light spectrum schedule to date on my tubgirls, which started as 5 plants, culled to 2 females:

11.20 - 4 x 27W 6500K CFL (108W) (sprout)
11.27 - closet coversion: 4 x 27W 6500K, 3 x 27W 2700K (189W) (spring)
11.30 - swapped 2 x 27W 2700K w/ 2 x 27W 6500K (summer)
12.02 - swapped 2 x 27W 6500K w/ 2 x 42W 2700K (219W) (midsummer)
12.08 - swapped 2 x 27W 6500K w/ 2 x 42W 2700K (249W) (late summer)
12.13 - pre-bud. switched from 24/7 to 18/6
12.17 - swapped 2x 27W 6500K w/ 2 x 27W 2700K (autumn)
12.20 - bud. switched from 18/6 to 12/12
01.03 - added 1 x 27W 6500K sidelight (276W) (stretch maint.)
01.05 - added 1 x 27W 6500K sidelight (303W) (stretch maint.)

This should give you an idea of what you need to get a group of plants through their life in a small closet.
Volker Reviewed by Volker on . Basic questions on CFL and color temp Ok, I spent the last few hours trying to get a precise answer and I failed. Theoretically, if one was to grow 3 plants what is the best way to go if one wants to go cfl? If one already had one 42w (equiv to 150w) soft white bulb (2700k - 3000k temp) and didnt want to 'waste' it what would one need to add in addition for optimal growth? I know there are higher color temp cfl so I'm not sure what would be ideal? Also, at different stages would one need to alter the set-up of cfs bulbs Rating: 5