Lifesystems 12 Hour Light Sticks Uses: Survival Aid The Lifesystems 12 Hour Light Sticks are primarly designed for emergency signalling devices & glow for up to 12 hours & come in both green & orange colours & are also an essential light source in emergencies. Survival Aids Exposure to extreme cold- wet & windy conditions- particularly when stationary on the mountain- can cause hypothermia & the shutting down of the bodys vital organs. In case of any emergency it is important to have the basics available to you. All Lifesystems Mountain Survival products have been tried & tested successfully in extreme conditions.