Boxes in yellow are computed based on your inputs in the green boxes.

compare CFL
wattage
life
bulbs  
cost
total bulb cost
power
$
TCO
$ 		$ $
total $ $
  1. Wattage
  2. Expected Life, Hours
  3. Number of bulbs needed for 11 years
  4. Cost of Bulb, each
  5. Total cost of all bulbs
  6. Power Cost $ / KW h $
  7. TCO (Total Maintenance Cost Comparison) per bulb change


    8. * 50,000 hours being equal to 11 years at 12 hours per day.