Thanks for that electric price guide. I am getting a 250 grow light, fan, timer and extraction unit, the tent is 3 foot square and 6 foot tall. I havent decided what strain yet. I am growing 3 plants. can anybody give me a rough estimate of electric costs in the uk? the shop told me its about a pound a day. I would like to start with a strain that is fast, 6-10 weeks, so that i can montor the cost.