Smart light switches allow you to remotely control your lights by voice command or with your smartphone. They have an advantage over smart bulbs because you can turn your existing lights and ceiling fans into smart devices. Once installed, you will turn your lights on and off effortlessly, leaving your hands free for more important matters. We have done the research for you and put together this how-to list to make installing your smart light switch an easy task. Step 1: Learn your existing wall switch and wiring setup. If the wall panel only has one switch, you need a single-gang. You also need to know what type of wiring you have.