well i think that i may have an alternative if you would like to go the CFL way. ive seen the yeild size and heat problems of both a 600w and a 1000w bring to the table. thats why when i found this light i flipped my shit. http://www.gchydro.com/detail.asp?product_id=Xteklight

this light is insane 1watt=92.59 lumens.......thats 4999 lumens per bulb. I have 3 four foot long ones with four bulbs each and the best thing is you can have it right next to your plants without burning them and your electricity bill is low and wont draw suspicion. (spelling)

Bottom line is, if you are willing to try a CFL like this you wont be dissapointed, i know i wasnt.

just me .02 cents :thumbsup:

-mike