> Electric lights are often cited as an example: people have responded to improved light bulb efficiency by installing so many more of them that there has been

> Electric lights are often cited as an example: people have responded to improved light bulb efficiency by installing so many more of them that there has been no decline in the total energy consumed by lighting. I blame GU10 and GU5.3 bulbs for that, yes, they (pre-LED) were more efficient than traditional incandescent shapes and fittings, but their light was/is so horribly narrow in beam focus that you need a lot more of them to light a room, so you get trends of 20+ 'downlighting' installed bulbs, at (pre-LED) 50W each instead of 1 80W or 100W round incandescent covering the whole room.