Perko Stainless Steel Bi-Color Boat Navigation Light This Perko Stainless Steel Bi-Color Boat Navigation Light features two lenses, one starboard green and one port red. It is certified for replacement use only on sail or power driven vessels under 12 meters 39.4 ft. in length. It is constructed with a black plastic base and a stainless steel top. It provides up to 1 mile of light visibility. Features Comes With Two Lenses, One Starboard Green and One Port Red Stainless Steel Top Certified For R