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| No brainer%3F Cost of CFL v tungsten filament bulb | ||
| 100W | 18W CFL stick | |
| Cost | £0.50 | £1.99 |
| Lamp life (hours ) | 1000 | 8000 |
| Total lamp cost (over life of one CFL ) | £4.00 | £1.99 |
| Total electricity cost* (over life of one CFL) | £63.20 | £11.38 |
| Total costs | £67.20 | £13.38 |
| Savings through the use of CFL instead of 100 W GLS%3Cbr /%3E | £53.82 | |
| *Based on an electricity price of 7.9 p/kWh %3Cbr /%3E %3Cbr /%3ESource: Energy Saving Trust - www.est.org.uk | ||