Lutron RA3 vs Caseta is the first decision to make if you’re planning smart lighting with Lutron. RA3 is short for RadioRA 3, and both systems let Lutron dimmers, switches and remotes talk to each other over Lutron’s own wireless signal instead of your home Wi-Fi. They suit very different projects, though, and the wrong pick can mean extra installation costs or parts that won’t carry over later.