Water Activated Personal Rescue Light For Life Vests The L8-3 is a water activated personal rescue light that is Coast Guard approved for use on life vests. The lamp and lens combo of the L8-3 produce a powerful light that’s visible for over one mile. This rescue light has a water activated battery, and once it’s triggered, it’ll last for 8 hours. Coast Guard approved for use on life vests Lamp and lens combo produces brilliant light visible for over 1 mile Operates in fresh or salt water Standard length lead wire 18 inches (46 cm); some custom lengths available (minimum quantities apply) Water activated battery Operation life exceeds 8 hours 5-year storage life