LED Bulbs UK explains how a £13 bulb is cheaper than a £1 bulb

Sept. 8, 2012 - PRLog -- If you were to buy one of LED Bulbs UK’s LED globe bulbs for £13 it would last for around 25,000 hours.
During those 25,000 hours it would consume 6 Watts of energy for 25,000 hours which would equate to an electrical consumption of 150kWh
25,000 hours x 0.006kW = 150kWh
Electricity for a UK home normally costs between 12p and 13p, so if we multiply the 150kWh by 12p we get the cost of running the bulb during it’s lifetime.
£0.12 x 150 = £18
If you add the cost of buying the bulb (£13) and it’s lifetime running costs (£18) you would have spent £31.
£13 + £18 = £31
If on the other hand you were to buy and run the £1 standard incandescent  40 Watt bulb for 25,000 hours it would cost you £120
0.04kW x 25,000 hours = 1,000kWh
1,000kWh x £0.12 = £120
Given however that the lifetime of a traditional bulb is only around 1,250 hours, you would have to purchase another 19 bulbs to run your light fitting for a period of 25,000 hours
25,000 hours / 1,250 hours = 20 bulbs
The cost of 20 bulbs therefore would be £20
If we add the running cost of an incandescent bulb to the cost of buying 20 bulbs we would have a total lifetime cost for 25,000 hours of operation of £140
£120 + £20 = £140
The difference in the cost of running a LED Light Bulb compared to an incandescent bulb is therefore £109.
Cost of running a incandescent bulb for 25,000 hours  – cost of running a LED bulb for 25,000 hours = £109
That is why the £13 bulb is cheaper than £1 bulb - £109 cheaper!!