15 Inch Large Glow Sticks are the largest commercially available glow sticks on the market. Inside these 15 inch glow sticks are 7 times the amount of glow chemical that you would find in your average 6" light stick. All this glow power makes these large glow sticks extremely bright with a long duration of glow. Common uses of 15 inch glow sticks include Fire Fighting, SCUBA Diving, Emergency Gas Leak Lighting, Boating and Emergency Disaster Lighting. 15 Inch Glow Sticks are a very bright and long lasting source of waterproof, non-sparking, non-heat producing light.