How to Use a Dimmer Switch With CFLs and LEDs The old dimmer switches in your home were made to work with incandescent bulbs. But there are switches that will work with the new styles of light bulb.

Look at your new dimmer switch or a new three-way switch. You should notice four screws, two on each side. One is green; that is the ground screw. One screw is black; the other two are brass-colored.