As of Jan. 1 of this year, the 60-watt incandescent light bulb—that classic of the genre; the Edisonian ideal; the signifier that illuminates in your mind’s eye when you’re asked to picture “a light ...

Three: a halogen, a CFL, and an LED. (Rimshot.) Don't get it? You will on Jan. 1, 2014. That's when manufacturers will stop producing 60-watt and 40-watt incandescent lightbulbs to comply with a ...