I live in the uk I want to produce about a killo of weed every other month, how much electircity would this use? and how power on lights would I need? 1000 watt? or more or less? would a 1.3m by 1.3 grow tent work?
2.2 pounds every 2 months is definitely doable, but not in a single 1.3x1.3 tent. You'll need a separate vegetative tent so you could veg while you flowered a batch. It'll take anywhere from 2-3 months to flower any given strain. Some sativas take 12+ weeks to flower though. Pulling that weight could be done with a single 1k watter in flowering if you did your part. It's close to a gram per watt, which is something a lot of people strive for as far as yield. You'll also need another light for veg. You can do the math yourself to figure out how much electric and how much it'd cost. Just simply take how many thousand watts x time used per day of everything you'd be running. This unit is in kW/hours. If you look at your electric bill it should have a kW/hour rate listed on it. Just multiply the number you got times the cost, and you'll have your cost.