That was an interesting one, as CFLs were and still are a rubbish replacement. Only in the last year or two has LED technology reached the point where it is a true replacement, though those of us sensitive to flicker still suffer from people installing cheap rubbish with a 50Hz pulse. (My house is now LED throughout, but I bought the expensive ones which are indistinguishable from tungsten in their light quality). I have wondered if the 50Hz pulsing on
For those locations where CFLs weren't the bset type there are Halogen bulbs. Their prices are almost the same as old type tungsten. Their life is much longer and they use about 30% less power for the same light.
LEDs are now getting better and their price is falling fast.
I wonder how much those who bought up the last of the tungsten bulbs are faring with their stock, not to mention those who got even more thirsty rough duty bulbs.
That one was silly, as one spends a tiny amount of time per day using one, so it was of almost no benefit, particularly as if one needs to vacuum for longer due to a less powerful machine, no gain is made.
The problem was that when tested, the highest power models weren't necessarily the best performers. A bit like old american gas guzzlers.