Gah was gonna say I use a combo of T12 32w / 40w 2300k 6500k Bulbs (my setup 6 fixtures) for vegging, but saw your space constraint.
watch out for Comperable and real watts on CFL also, most packages will say 40w 60w Ect. and if you look close they say actual wattage like 9w
Even the huge ones...