Residential Lighting
Calculate Your Savings
Savings each time you replace an incandescent bulb by an ENERGY STAR qualified CFL.
Calculation Parameters
Notes- Given that a bulb is turned on three hours a day on average, 10,000 hours of lighting corresponds to a service life of about nine years.
- Savings in addition to Hydro-Québec's mail-in rebate.
Parameters
| Incandescent bulb |
Compact fluorescent bulbs |
|
|---|---|---|
| Wattage | 60 W | 15 W |
| Service life | 1,000 hours | 10,000 hours |
| Energy consumption | 600 kWh | 150 kWh |
| Price per kilowatthour | 0,0746 $ | 0,0746 $ |
Calculation of electricity savings for 10,000 hours
| Incandescent bulb |
Compact fluorescent bulbs | Savings | |
|---|---|---|---|
| Purchase price | $9.00 ($0.90 X 10 bulbs) |
$2.70 ($2.70 X 1 bulb) |
$6.30 ($9.00 - $2.70) |
| Electricity cost | $44.76 (600 kWh X 0.0746$/kWh) |
$11.19 (150 kWh X 0.0746$/kWh) |
$33.57 ($44.76 - $11.19) |
| Total cost | $53.76 $9.00 + $44.76) |
$13.89 ($2.70 + $11.19) |
Outdoor bulb $39.87 ($53.76 - $13.89) Indoor bulb $20.40 ($39.87 - $19.47*) |
*Because CFLs emit less heat than incandescent bulbs, your heating system has to make up the difference during the heating season. Even so, you'll save $20.40 over the lifespan of each CFL bulb used indoors (estimate for an electrically heated single-family dwelling).
