Cyalume® lightsticks by 10

Essential safety equipment, becomes indispensable for every crewmember sailing at night.
Visible at a distance of over one mile, this watertight floating light features an eye for attachment to a sailing jacket.
100 % reliable, unbreakable, non-corrosive, watertight, nontoxic.

It does not produce any flames or sparkles, it is nonflammable, does not require any batteries and can be used in a variety of circumstances :

Man overboard, gas leak, electricity failure or black-out, engine breakdown, windward use, in or below the water, mooring light...