Purchasing smart LED bulbs for the home is a little like selecting HD-DVD or Blu-ray. Like regular old incandescent, or CFL or halogen or LED bulbs, smart bulbs—which can be controlled by your phone—fit your regular old sockets. You’ll need to choose a system and stick with it if you want to have a separate phone app for each room of your home, hoping that the system stays around so you can buy replacements in future. You wish that the app you use to switch your LED lights on and off is renewed to work on any new phone you might buy.