I think with that kind of power your limiting factor is the heat generated. Too bad you don't have the room for a 3x3 with 6" ventilation. I think the added vertical growing space would add significantly to your yield. I read the stats on the lights, very impressive if it performs as published.
March update on So Cal 3x3 tent grow (in shed outdoors). The driest February on record is now past. I have put away my humidifier and humidity controller. Now we are looking at what is a "March Miracle"; a persistant low pressure system that seems to be making up for the driest Feb. on...
Just a few years ago I could count on stable weather conditions for a tent grow. Not anymore. January was a roller coaster of 60 mph Santa Ana wind conditions driving humidity down into the low teens, nights in the low 40's, and the occasional days nearing 90 degrees. I am fed up with the...
So if it's actual draw is around 330 watts, every 3 hours your consuming a kilowatt hour. In So Cal we pay around .15 kw hour. 18 hours / day is 6 kw hours @ .15 = ninety cents a day. Don't forget to add in your fan wattage, in a tent you will need ventilation.