This Mainstays Solar Powered LED Deck Post Cap Light produces 5 lumens of bright light. The light provides both ambient and functional lighting keeping your landscape both safe and beautiful. Two adapters included for mounting on top of either four-inch or six-inch posts. It is easy to install and powered by a rechargeable nickel-metal hydride battery included that will provide up to 8 hours of illumination during the evening hours and automatically activating with the dusk-to-dawn sensor.