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Can someone help me work this out. I pay 23.926 p/kwh for the first 180kwh then 10.475 an hour after that. Ill be using a 600 watt light and was wondering how to work out approx what it would cost to run it.

http://www.hg-hydroponics.co.uk/htg-kameleon-stealth-draws-359-p.asp What are peoples opinions on these, im useless and DIY and uber stealth is the only was the wife will let me grow. Does anyone know if its a good product?