"Outputting an elliptical style beam for broader and brighter road coverage this modular 600 lumen lighthead can be swapped between small, medium and large PWR Bank batteries for longer runtimes. When Knog designs each light, we put optics at the heart of that equation. Whether itâ€™s new LED formations, or beam patterns, we are committed to making each lumen work harder once youâ€™re on the road. If you do more than one type of riding then this modular light system will let you expand your product range without shrinking your wallet. Get a stronger lighthead for brightness, or a bigger battery for runtime."