201-020-FB-B masthead light 2 NM 360° white licht. The configuration follows the application identified in the product name. Article 201-020-FB-B. Visibility: 2 NM. Lopolight LED navigation light with IP68 protection and 10–32 VDC supply, intended for marine navigation in accordance with COLREG72. The standard housing uses anodized aluminum with a PMMA lens and A4 stainless-steel fasteners.