Life cycle
What is the life cycle cost of the various forms of lighting?
Household tungsten lights were cheap to manufacture and presumably to recycle - but with poor energy efficiency over relatively short lives. The "spot light" form factors seemed to have much shorter lives than the traditional bulbs.
Excluding subsidies, CFL bulbs were expensive - and need specialised recycling. They have often failed quite quickly and the light output has never matched the claimed "equivalent" tungsten bulb.
LED lights are also expensive - and need specialised recycling. My current sample has not yet had a failure - even though it is a quick on/off light to save ignition wear on the fluorescent tubes. Electronic components, and tungsten bulbs, generally seem to fail from switching surges.
My quick on/off kitchen lighting was a decorative 1970s cluster of 6 x 25w tungsten bulbs - which gave rather dim lighting. CFL bulbs of that shape didn't create the same effect - and overall it was just as dim. The replacement LED light fitting takes a nominal 3 x 4 watts and is nice and bright.
I didn't have to economise on the electricity bills - but the original tungsten fitting was merely being pretty in an otherwise functional room. To give a bright even light the kitchen has 2 x 80 watt fluorescent tubes. They only needed new tubes after 30 years - and LED alternatives in that form factor were not available at that time.