Toggle between flashing white and constant-on white light with the black Meridian Strobe/Constant Dive Light from Princeton Tec. Depth-rated to 328', the Meridian slips onto PFDs, tanks and any 1" webbing and shines 100 lumens from its Maxbright LED. It can serve as a marker for divers or a navigational light for paddlers, and makes a nice tent light, too. Runtime on a fresh set of three AAA batteries is a generous 60 hours.