How spiral compact fluorescent bulbs are formed - GIF

[Jon]

I'm not exactly certain that this is the single most useful tool in all of human technology. However, still interesting. I will say that LEDs have improved with "warmer" light spectrums, and are certainly cost-effective, but, all other things being equal (they're not), I still prefer the light quality of incandescents. I wonder if this is objective or just a relic of my past lighting experience. For example, when light bulbs first came into prominence, did people denounce their light quality as inferior to candles?