Mildly weird piece, in that it's really measuring two things; lighting efficiency (and only at an extremely low resolution, implying a whole-system efficiency that doesn't change between the invention of the light bulb and the fluorescent light) and wage growth. 60 hours of work may have bought 72 hours of electric light in 1880, but rather more in 1990, say, for a combination of both reasons. That said, LED bulbs do…
But I consider them expensive and a lot of them surprisingly don’t last that long, especially for their price. I’ve already replace two out of three led light fixtures that are supposed to last at least a decade and it hasn’t even been 5 years.
I hope the quality improves or there’s some system out there so I can get a reliable lightbulb that lasts and/or doesn’t randomly flicker.