Perko 36 All-Round Boat Navigation Light This Perko All-Round Boat Navigation Light helps preserve night vision and provides a reduced glare. With a black polymer top and collars, the amount of light wasted outside of the visibility zone is greatly reduced. Offering a stow-a-way plug-in pole with contemporary styling and a clear fitted globe, this boat navigation light provides long lasting use. Features Black Polymer Top and Collars Reduced Glare Light Helps Preserve Night Vision Stow-A-Way Plu