Solar Post Lights - Outdoor Solar-Powered Post Cap Lights for Fence, Deck, Patio, or Garden Decoration. These LED lights fit 4x4 inch posts and emit a warm white glow. Comes in a pack of 4. ALHAMBRA | ALHAMBRA Low Voltage Solar Integrated LED Fence Post Cap Light 5.1 H x 4.17 W x 4.17 D in grayGlass / Plastic in Nickel | 5.1" H X 4.17" W X 4.17" D | Wayfair