|
| |
|
Compact
|
Standard |
"Long-Life" |
| |
|
Fluorescent |
Incandescent |
Incandescent |
| |
|
|
|
|
| Brand |
|
Lights
of America
|
General
Electric
|
General
Electric
|
| Lumens
(a more accurate measurement of
brightness) |
|
860 |
865 |
820 |
| Wattage
(measure of energy used, not of
brightness) |
|
15 |
60 |
60 |
| Price |
|
$8.99 |
$0.40 |
$1.20 |
| Expected
Life (hours) |
|
10,000 |
1,000 |
1,500 |
| |
|
|
|
|
| Bulbs
(and bulb changes)/10,000 hours |
|
1.0 |
10.0 |
6.7 |
| Capital
Cost of Bulbs |
|
$8.99 |
$4.00 |
$8.00 |
| Amount
of Electricity Used for 10,000 hours
(kWh) |
|
150 |
600 |
600 |
| Cost
of Electricity (kWh) |
$0.06 |
|
|
|
| Cost
of Electricity Used |
|
$9.00 |
$36.00 |
$36.00 |
| Capital
and Operation Cost of Bulb |
|
$17.99 |
$40.00 |
$44.00 |
| |
|
|
|
|
| Use
(hours/day) |
4
|
|
|
|
| Life
of Bulb in Years (average use 5
Hours/day) |
|
6.85 |
0.68 |
1.03 |
| Cost
of Electricity Per Year |
|
$1.31 |
$5.26 |
$5.26 |
| |
|
|
|
|
| Annual
Amount of Electricity Saved (kWh) |
|
66 |
|
|
| Annual
Cost of Electricity Saved |
|
$3.94 |
|
|
| |
|
|
|
|
| Percentage
Return on Investment (tax-free) |
|
43.85 |
|
|
| Payback
in Years |
|
2.28 |
|
|
| Green
Bragging Rights |
|
Priceless
|
|
|
| |
|
|
|
|
| NOTES:
Prices are from April 2001 |
|
|
|
|
- Bulb Prices
from Bi-Mart
|
|
|
|
|
|
Electricity Price from City
of Ashland Utility (average monthly use in kilowatts
divided by monthly bill (accounts for base fees)
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|
