| Re: Is aquarium lighting energy efficient? |
Subject: Re: Is aquarium lighting energy efficient? by Fishlady on 11/11/2013 22:43:06 Just multiply the wattage of the bulbs by the number of hours per day they re on and you'll see how much they use. For example 2 x 54 watts on for 8 hours a day is (2x54)x8=684 watts. Over a week that's 6 KwH at whatever your electricity price per unit is. Average is about 15p a unit so in this case the cost is 90p a week. |