Cyalume Chemlight 6" Light Sticks are a bright and dependable source of emergency lighting. Cyalume light sticks are clean, non-toxic and safe in all environments whether near gas or oil, or any combustable materials. Cyalume 6" light sticks come in six colors and last anywhere between 12 and 8 hours after activation which occurs by simply by striking a hard surface. Cyalume light sticks are being used in homes, hospitals, schools, nursing homes, offices, hotels, trains, and industrial sites.