Remember when light bulbs were simple? There was one kind (incandescent) at maybe four wattages- 25, 40, 60 and 100 were common- and sometimes you’d encounter something fancy like a 3-way bulb or maybe a colored bulb. Sure, they were inefficient and unrecyclable, but they were ubiquitous, and every grocery store, gas station and hardware store in American carried the exact same ones.
Then along came the CFL and everything changed. Incandescents were out; CFLs, halogens and fluorescents were in. Yes, they had traces of mercury in them that made them dangerous to break, and they had to go back to the store to be recycled. So LEDs were introduced. With their super-long lifespans and ultra-efficient electricity consumption, they seem to have won the game.