100W light

[lafrancaise]

Could anybody tell me if a 100W light bulb gives off 100W of heat. If so by having 10 lamps burning 100W light bulbs would be the equivalent of a 1KW heater.

[mrbatfink]

Although a large portion of the power is converted heat, its main function is to conver the power to light. So no it will not give the same amount of heat as a heater. Different lights give off different amounts of heat, you will find energy saving bulbs do not get as hot as std ones.

[lafrancaise]

Thank you mrbatfink

[Toureman]

10X100 Watt bulbs will still use the same electricity as a 1000 Watt electric fire bar.

Is this what you meant to find out?

If you replaced 10x100 Watt bulbs with ten energy saving bulbs of the same brightness you would save over 800 Watts of electricity! and have lower bills!

[Space]

a 100W light bulb gives off 100W of heat unless you allow some of the light to escape though windows for example.

Most of the 100W is instantly converted to heat by the bulb, the rest is converted to light.
Then, whenever the light hits an object, some of it gets converted to heat.
In the end, only a very small fraction of the energy will escape, and you will get nearly 100W of heat.

[lafrancaise]

So Space, does this mean I could heat a room with light bulbs such as 10 100W light bulbs?

[Space]

yes you can heat a room with light bulbs.
You can basically generate heat with any electic device (computers, oven, vacuum cleaner... )
because all the electric power is converted to heat sooner or later.

But remember that electicity in the UK is not as cheap as in France, and you'd better have a gas heating instead ...