CFL Calculator PDF Print E-mail
Enter kwh cost: ¢per kWh
# of hours light is on per day:  hours
   
Regular (incandescent) bulb:

Power consumed:
Cost of bulb: $0.50
Lamp life:
750 hours
Lamp life=
8 months
Annual energy cost:
$5.52
Total bulbs required:
13 bulbs
New CFL:

Power consumed:
14 watts
Cost of bulb:
$2.20
Lamp life:
10,000 hours
Lamp life=
9.1 years
Annual energy cost:
$1.29
Total bulbs required: 1 bulb
 
Total cost of bulbs and energy: $57.40 minus $13.96= a $43.44 payback
on $1.70 invested!
 

The difference in the cost between the two bulbs is $1.70. If you invest that now, it will put $4.23 back in your pocket every year,

Last Updated on Friday, 06 October 2006 05:03
 

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