Use our energy savings calculator to calculate the total cost savings you would benefit from by using efficient bulbs instead of inefficient ones for your lighting requirements.

The lifetime cost of an efficient bulb is made up of the purchase price of the bulb, plus the total energy cost to run the bulb over its expected lifespan.

To calculate energy savings of an efficient bulb over an inefficient bulb, the energy cost to run the inefficient bulb is calculated over the lifespan of its efficient bulb equivalent. This is added to the initial purchase price of the inefficient bulb multiplied by the number of inefficient bulbs required to last the lifespan of the replacement efficient bulb.

Try our to see how much can you save.

Residential cost of electricity based on New Zealand Average price 2008 of 22.97cents/ kWh. 6000 hours is the minimum expected lifespan of a quality CFL (note some CFL bulbs are now rated up to 15,000 hours providing far greater savings potential). Source: Electricity Commission.

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