Calculating Light Energy Costs

Here is a simple formula for calculating the energy costs of your light.

Information to gather:

STEPEXAMPLE
1. Get your energy costs in kW/hr from your utility bill. (KW)
$0.12
2. Fixture Qty (FQ)30
3. Bulb Wattage (BW) Use 1 for 1000W, 0.6 for 600W, and 0.4 for 400W.6
4. Hour lights run per day (HR)16

FORMULA

BW x KW x HR x FQ  = Cost to run fixtures per day
0.6 x $0.12 x 16 x 30 = $34.56 / Day
Multiply by the number of days in a month to get the monthly rate