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Ho​me​lab 

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Light replacement calculator

Enter tariff from your power bill and up to 5 light replacement scenarios including old and new wattage (after replacement), number of globes and daily usage in hours/day. Press Calculate button to show results.

You can add or change the data and recalculate to see the difference.

Tariff (c/kWh)
Old wattage New wattage Qty Hrs/day Savings ($/year)
1
2
3
4
5
Total

This light replacement calculator is indicative only, and should not be solely relied upon as a complete calculation tool for any rebates or savings. Homelab accepts no responsibility for errors or miscalculations of this calculator. The results may not be accurate as some input data depends on correct estimation.

The table below shows typical light replacement options, with before and after wattages. The wattages are quoted on like-for-like basis, that is, the new light should produce same or marginally higher light output.

 Product

Old wattage

New (LED) wattage

 Incandescent globes

75W or 100W

7W to 10W

 Down lights

35W or 50W

5W to 8W

 Fluoro tubes 600mm

18W

7W-9W

 Fluoro tubes 1200mm

36W

12W

 High bays

400W

80W

 Shop lights - rectangular

70W or 150W

18W or 24W

 Shop lights - round

2 x 26W

15W

 Reflectors

75W to 150W

12W or 15W  

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