AmeriGlo light sticks are rated as an industrial grade, mil-spec light stick, ideal for long term storage (up to 4 year shelf life), and use in all weather conditions (100% waterproof and it floats). These non-toxic light sticks are available in multiple colors for brighter, more versatile use with longer illumination than novelty grade glow sticks. Green is able to light a standard hotel or bed room. Yellow is ideal for illumination, marking, and signaling. Blue is perfect for tent camping due to the soft light. Orange is ideal for confined space and when maximum light is needed, for a specific duration. Red is often used in training exercises.