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Well I don't completely agree chip.
In the case of ligt bulbs (incandescent or fluorescent):
Electrical energy = light + heat
I think it's irrelevant how efficient light bulbs are at producing heat, since the only two things they produce are light and heat. A candescent light bulb's inefficiency in producing light should be made up by its efficiency in producing heat. The total caloric energy of the air contained in a room to keep it at a certain temperature will stay the same, regardless of what is the source of heat (a heater as opposed to a light bulb or a combination of the two). When the bulb produces less light and more heat, the heater will have to produce less to add to the caloric energy of the air, equivalent to the amount of joules per second the light bulb loses in heat.
I'm not even taking into equation that, in a room without windows, all light will eventually be converted to caloric energy.
Or am I missing something?
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