hps is the way to go i think, cfls do work and thats a fact and can produce great buds, i only switched to hps as i was using around 400watts with the cfls so i switched to a 400watt dual spectrum hps, so im not using any more power but getting 55,000 lumins now, temps are an issue and cant have grow door closed for to long, im using glr method so the door is closed for the 1 hour of light during the 12 hour dark period and the temps are ok for that, but as outside temps are getting higher im having trouble keeping temps down with the door closed, but im using built in brick drying cupboard and it does have a vent at the top that i blocked off in case it stinks the others flats/apartments out, i could really do with some sort of venting system to keep things cooler, so im thinking of using the vent to get air in the grow room if i fitted a bathroom fan into the vent and fitted it backwards so it was bringing clean cool air in then i should be ok, but for now i have the door slightly open and that keeps temps in check, as my lights are on during the day time i dont have problems, so for now im doing ok,
do you know how many lumins your getting with your hps, mines 400 watt and 55,000 lumins, i just wondered how yours compared to mine, would say 2 x 150 watt hps give me as many lumins as my 400watt, it would mean i could use less power but if the lumins where around the same then id probably sell my 400 and buy 2 x 150 watts, it would fill my room better and spread the light more, but it all depends on the lumins,