Glow Stick Lifespan: Cold vs. Warm Water Explained

Chemical reactions slow down when the temperature is lowered. This means that the chemicals inside a glow stick will react more slowly in cold water, and the glow stick will last longer. In hot water, the chemicals will react more quickly, and the glow stick will burn out more quickly.

So, if you want your glow sticks to last longer, put them in cold water.