Outdoor Solar Lights Idea: Solar Post Lights for Decks, Fences, Railings I installed these solar post lights and LOVE them! They look so beautiful as backyard lighting. Easy to install, and they fit 4x4 and 3.5 x 3x5 posts. You can choose warm or cool lighting by toggling the switch inside the solar light. They are beautiful outdoor solar lights that will add warmth and ambiance to your backyard! Landscape lighting | solar lights | backyard lighting | front yard lighting | curb appeal | patio decor | deck light | fence light | stair light LTKSeasonal LTKHome