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I read somewhere that because low-energy lights give off less heat, the heating in your house runs slightly longer to compensate for that, and as a result almost completely negates any energy saving you think your making.
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True in the winter, not true in the summer, when you wouldn't have the heating on anyway (you do have double glazing and loft insulation, I hope?). It's more efficient to heat using, er, a heating system, anyway, since it heats from the floor up rather than the ceiling down.
It's not just 'hey I've got low-energy lightbulbs', of course - other energy saving matters, like replacing your computer with a newer one with better energy characteristics - laptops are better than desktops here.
I think we've got one or two tungsten bulbs left, the rest have been replaced by LE ones over the last year or so as they've gone bang. No mass-replacement or landfill use beyond what would happen anyway. None of the LE ones have broken or been dropped - some are better than others, so the dodgy ones get relegated places where they're not needed so often, like the downstairs bog (which, being a non-double glazed ex-outside-lav, isn't the most congenial place after dark anyway). There's one fitting that's too tight for the current generation of bulbs, so we have to keep a store of tungstens for it, which is annoying. When I find a small enough LE I'll replace it.