Stop walking across a dark room to turn on the light. Install a 3-way switch and control lights from two locations.

How to Add a Light Switch to Any Existing Outlet It's not too complicated and can make brightening up a room a lot more convenient.

Time to learn how to wire a light switch. You know that you need to change a switch when the lights go in and out, or if they make a beelike buzzing noise.

A new Philips Hue add-on turns your existing light switches into smart ones that keep your lights available even if someone flicks the switch off.

Called the “wall switch module,” it’s expected to ship later this year — spring if you’re in Europe, or summer if you’re in North America. Once wired up, it turns your existing light ...