The exposure flash packs a punch to get you noticed day and night and it39s also bright enough to see your way home when you get caught out and small enough to hide in your pocket the light is fully sealed for weather protection easy to use and you simply rotate the head to turn on and off the disposable battery flash exposure light will produce 40 lumen output to light your way and aid lamppost lighting the flare on the other hand is the talk of the town the exposure rear light is so br