U.S.C.G. certified lights (battery or lightstick) and 'sound making devices' are mandatory on all Class I life jackets for passenger carrying vessels. Have been forever.
Bill

http://www.billfishcharter.com/

http://www.pennreels.com/

http://www.mustad.no/

http://www.aftco.com/

http://www.candhlures.com/