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The cost of running a light is directly related to the
wattage of the globe. The higher the wattage, the higher the running
cost. Compact
fluorescent lamps (CFLs) are cheapest, when the life cycle cost is
considered. The cost of your lighting will also depend on the type
of lighting you select and the length of time you leave your lights
on.
The table below shows the lifecycle costs for lighting systems using
different globes to produce the same amount of light. Lifecycle costs
include purchase, running and replacement costs.
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18 W CFL |
100 W Incandescent |
65W Halogen |
| |
The above examples all provide the same amount of light. |
| Running cost over 10,000 hours* |
$17 |
$90 |
$68** |
| Average life |
6,000 hours |
1,000 hours |
2,000 hours |
Purchase cost |
$7
1 lamp |
$3
6 bulbs @ 50c |
$6
3 lamps @ $2 |
| Total cost |
$24 |
$93 |
$74 |
* Based on 15 cents per unit of electricity,
** Includes magnetic transformer losses.
Running Cost ($) = Light Wattage (W) / 1000 * Running hours (Hours) * Electricity tariff (cents/KWh)
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