It’s generally accepted (at least by me) that compact fluorescents (CFLs) and LED bulbs are improvements over the old-fashioned incandescent bulbs. They have however one serious disadvantage: they use so little energy that you don’t feel guilty anymore when you forget to switch them off when leaving a room.
The next generation of energy saving bulbs should have built-in motion detectors that switch the light off when there is nobody around.
For birthday cakes we need led lamps too. But I want to be able to blow them out.