Really Simple Way To Add Up Your Lighting Electricity Costs.

You can use a simple Math Formula to work out your electricity usage;

Wattage of all your lights x Hours Used Per Month x Cents Per KiloWatt / 100000 = Cost of power used Monthly

E.g
I have 5 CFLs Rated at 25 Watts
I am using them 18 hours a day for a month
My Power Company is charging me 18.95 Cents per KW

5 x 25 = 125 (Wattage of all my lights)
18 x 30 = 540 (Hours Used Per Month)

125 x 540 x 18.95 / 100000 = $12.79

This setup will cost me $12.79/month
Remember that if you are working out CFLs don't use the incandescent equivalent.

WeedMan1337