Watts per bulb 

# of Fixtures/Bulbs 

# of Hours per Day 

# of watts per day 
Lighting usage watts per day 
Divided by 1000(kWh) 
Kilowatt hour light usage 
# of Working Days 

Total kWh per month 
Lighting kilowatt hours per month 
current kWh cost 
$ 
Maintenance & Ballast Monthly (p/bulb) 
Ballast Monthly Cost 
Maintenance & Ballast Monthly Total 
Ballast or starter monthly total 
Cost per month to burn 

Cost per month to burn w/HVAC 

Total annual cost to operate 

Total annual CO2 Emissions (metric Tons) 

HVAC Loads @ % monthly cost factor 
