Review on Stay Safe Anytime With Cyalume Yellow Emergency Glow Sticks - 10-Pack Of 6” SnapLight Survival Glow Sticks For Emergency And Hiking by Russell Roberson

Reviewing color: YellowAt over a dollar each these are best for emergency use or as a safety light for a Halloween night. I tested one and for the first 15 minutes it gives off light equal to about 1/2 the light of a standard night light. For those roughly 15 minutes, you can read black and white about a foot away from the light source. After that the stick starts to dim to a low glow until the only visible light is of the liquid in the stick. Technically it will last 12 hours, but realistically the light stick is only useful for a short time under most situations. Unless you are in a harsh environment where flashlights won't cut it, these are not a necessary item to have as a light source for most emergencies.Pros:Instant emergency light that can be used in almost any type of environment.Good to get attention/warn others in a dark/harsh environment while liquid is at its peak.Cons:While the stick is 6 inches from hook to base, the amount of illuminated liquid when completely mixed is just over 3.5 inches.Price, at over a dollar each there are longer lasting reusable light sources you can obtain for emergency use.Duration of "useful" light much shorter than advertised.UPDATE: OctoberSince it's that time of the year, I decided to do another test of these light sticks to be sure I was giving it a fair review. Testing the same color (Yellow) I combined the liquid and early in the test the stick was bright, almost nearing the light given off by a night light. But within 30 minutes the brightness diminished and became a steady glow. An hour into monitoring, in a dark 5x10 room with no internal/external light sources the light stick could barely illuminate half the room, which at this point was about half the light given off by a night light.One observation while testing this in a dark room was that the higher I held the stick, the less light that was directed straight down from the stick, which counteracts the purpose of hanging this stick using the hook. It would appear to be better to hang the stick parallel to the floor due to the design. After checking the stick at the 12 hour mark, the liquid was completely dark.I really would like to give this more stars as it does do what it is intended to do, but for an item that could be potentially used in an emergency situation to save lives, the claims of this lasting up to 12 hours is still overly exaggerated. While it may be possible to have a stick last that long, realistically I would put this more in the 6-8 hours range at most.