Halogen bulbs, a type of incandescent, remain an option but will cost you more than twice as much to power as LEDs and CFLs and don't last anywhere near as long. LED technology is evolving rapidly.

That's when manufacturers will stop producing 60-watt and 40-watt incandescent lightbulbs ... you will have three options: halogen, CFL, and LED bulbs. Luckily, all are energy-efficient ...