Incandescent bulbes are crappy heaters.
It's great that they can heat up a cold roof, or a cold lamp that they are sitting in, but they don't distribute heat throughout your house well at all. Your furnace is still going to have to come on, because most of that heat will never reach the thermostat.
You can just do a net energy equation on that one for cold places and say CFL bulbs suck.
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