Lightstick are light, waterproof, relatively cheap, multicolour, they don't need batteries, they don't heat up and they glow for up to 12 hours. Just bend it to the first "crunch", shake it and it's ready. Lightsticks, also known as glow plugs, or simply chemical lights, have found about a million applications over the last 40 years. The range of applications goes beyond the outdoor and military industry. For years, Lightsticks have been a sensation at parties, divers have also used them for a long time, and preppers have them as thoroughly as canned goods.