do what ones are more energ efficent as i am only 18 and bought my self a flat so money is a bit of a problem as my mates want to buy corals for the tank as they like the look off them cheers
Well tbh, there isnt much of a difference. A magnetic ballast will use more electrisity than an electric one. But on a 150W single halide it may save you 15-20W. Just turn appliances off stand by. Switch lights off. Use energy saving bulbs around the flat. This will save you more money.