Serge Auckland wrote:

Quite apart from the problems of disposing of old CFLs, I question the whole
principle of Low Energy lighting. If you have a conventional bulb, much of
the energy output is in the form of heat, which will help heat the room, and
consequently will reduce the need for other heating, central or otherwise.

That's sort of fine if you want extra heat. Often as not you don't.

The other downside of your idea is that electricity is more costly than other
heat sources (often by a large amount).

No, that's no excuse for low efficiency lighting.

Graham