This 300-139 black double steaming light v 6 nm 5 provides a purpose-specific solution for onboard use. Reference article: 186939Z. Visibility: 6 NM. Vertical mounting. 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.