Incandescent has other advantages. For example, in winter time if it is cold and it is also dark in winter time, then the heat can be beneficial. In summer time you should not need the light so much since there is already the light. Either way you should not need to use the light too often, and if you do not use the light too often then you can save energy by that too, and does not need to be replace as often.
Of course, that electricity could still better be used to power a heat pump. Or the money saved on electricity could be spent on insulation, or, more likely, used to buy natural gas / propane which is usually extremely cheap per unit of energy.
