@Dunk_Junk,
I switched awhile back to electric. my 1000w is on 75% and my 600 mh is on 100%. i did run my 1000w on 100% 24h a day and because of that i was using "prime" electric hrs which is like .20-.30 more per kw. my bill was litterally double wat it was when id have it on 18h. and just doesnt make sense electrically to grow on 24h for me.
@Sggtfghkirer, If you're still using HID you need to get some digital ballasts instead of the old magnetic ballast. I did a test, my old 600w magnetic ballast was pulling WAY MORE than my 'new' 1000w digital ballast.