Average number of hours on per year:
  
Electric cost per kilowatt hour:
  
 
Lamp 1
 
 
Watts (fixture watts/# of lamps):
 
Cost (including disposal cost):
$
Life in hours:
 
Cost of labor to replace lamp:
$
Mean lumens:
 
 
Lamp 2
 
 
Watts (fixture watts/# of lamps):
 
Cost (including disposal cost):
$
Life in hours:
 
Cost of labor to replace lamp:
$
Mean lumens:
 
  
  Lamp 1 Lamp 2
Cost over lamp life $ $
Cost per 1000 hours $ $
Cost per Year $ $
Cost per million lumen hours $ $
     
  Savings with Lamp 2: $ /year