Light up your life!

Not sure who did the maths here, but a lightbulb costs around 1p per hour to run..

I think someone calculated the saving of 80% on the whole average electric bill, assuming that the only electric consumed in a house is from light bulbs...

Most of the cost in an electricity bill is down to power showers, cookers, heaters etc, not light bulbs.
 
Lakeland said:
Not sure who did the maths here, but a lightbulb costs around 1p per hour to run..

I think someone calculated the saving of 80% on the whole average electric bill, assuming that the only electric consumed in a house is from light bulbs...

Most of the cost in an electricity bill is down to power showers, cookers, heaters etc, not light bulbs.
Click to expand...

If the statements made were true, then the average house in the UK has a 100W lightbulb on in every room of the house every second of every day and night. Roughly.

£700 saving going from 100W to 5W, so the cost with 100W bulbs would be ~£740.

£740 buys you 6166 KWh at 12p/KWh

6166 KWh is 61660 hours at 100W.

61660 hours is ~2560 days.

So in order to use 6166 KWh in a year with 100W bulbs, you'd need 7 (2560/365.34) bulbs on constantly every second of every day.


Or looking at it another way...

These bulbs, according to the spec sheet from the manufacturer, are rated at 6.5W and are roughly as bright as an 9W CFL (a standard "energy saving lightbulb"). You can get those for a quid each, easily.

So...for an extra £21 you can save an extra 2.5W.

£21 buys you 175KWh of electricity at 12p/KWh.

So you would need to run this bulb for 70,000 hours in order for the savings over an equivalent CFL to add up to the increased cost over that CFL.

Which is 8 years of continuous use, 24 hours a day 365 days a year.
 
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