Timer light switches are designed to replace conventional light switches—you just remove the standard switch and install the timer switch in the same electrical box. In this article, we discuss timers generally used for indoor applications. For information on outdoor varieties, see Energy-Efficient Outdoor Lighting.
How does a light switch timer work?
A light timer is an electrical circuit with a built-in clock. Acting as a communicator between the power source and the light, the timer turns lights on and off based on the times you set. Available in a variety of sizes, these devices come equipped with controls ranging from circular dials to digital settings.
