On Jun 6, 5:48*pm, Bill Baka wrote:

I don't know about you guys, but I like my filament bulbs in the winter.
The lack of efficiency just helps heat the room I am in, so no big deal.
My summer bulbs are CFL's, soon to be LED's when the price comes down to
something a mere mortal can afford.

In the winter, this is probably true - what you lose on light
efficiency you save on heating. Then, the question becomes - per unit
of tangible heat energy, what costs less - the electricity to light
the bulb or the "other" source?

I am sure this can be calculated, but not by this guy! :-)