you can, but your plants and yeild would suffer.

for a hundred bucks, you can get a new 400w hid, if you look hard enough. i suggest you use those only in veg, bring out the big guns in flower.
Laredo Reviewed by Laredo on . CFL Light Question Can I use six 30watt Full Spectrum Daylight 5900K CFL lights in about a 3X3 area for both veg and to flower? I just bought these off ebay and could anybody take a guess at how many lumens per light that is? the listing never said but I figured six of these should be good. Rating: 5