Cyalume 6-Inch ChemLight- The Cyalume ChemLight is a military grade light stick that meets the Defense Logistics Agency and NATO Maintenance and Supply Agency Specifications, and provides up to 12 hours of light. These Chemlights come individually wrapped, have a four year shelf life, and provide 360 degrees of illumination. With a non-toxic chemiluminescent substance and high light output these chemlights are great for your emergency lighting needs.