LED or the light-emitting diode light bulb is a good energy efficient option for lighting, often beating out CFL light bulbs in power efficiency and longevity at a similar price. A typical cheap (60 watt equivalent to incandescent) LED light bulb is advertised as providing 800 lumens, lasting up to 10,000 hours at 10 watts.
See the electricity cost of a single LED light bulb running at 10 Watts for 5 hours a day @ £0.19 per kWh
Cost Per Hour: £0.0019
Cost Per Day: £0.0095
Cost Per Month: £0.29
Cost Per Year: £3.47
kWh Per Day: 0.05
Tip: When consider purchasing LED bulbs, shop around as the prices can vary greatly.