US lawFederal (United States)RegulationsTitle 46 CFR — ShippingChapter I — COAST GUARD, DEPARTMENT OF HOMELAND SECURITYPart 108 — DESIGN AND EQUIPMENTSubpart G — Equipment Markings and Instructions108.63946 C.F.R. § 108.639Emergency lights.Last amended: 2016Year: 2026Length: 7 wordsOfficial source Cite as 46 C.F.R. § 108.639 (2026)Each emergency light must be marked: “E”.Previous46 C.F.R. § 108.637Next46 C.F.R. § 108.641