Cyalume9-03680 ChemLight Military Grade Chemical Light Sticks – 30 Minute Duration Light Sticks Provide Intense Light, Ideal as Emergency or Safety Lights and Much More, Standard Issue for U.S. Military Personnel – White, 6” Long (Pack of 10)

Bought a supply of these after living through hurricane Irene this summer, and they're everything they claim to be.The packaging is sturdy and made for long-term storage, yet it just takes a second to rip one open and light it up. I've tried both the "commercial grade" and the "military grade" (these are the milspec), and the military grade seems to burn somewhat brighter and longer, although to a degree, intensity and duration seem to depend on ambient temperature. These are the "high intensity" ones that are quite bright, but only last 30-60 minutes. I found that you get a solid 30 minutes at the high brightness, and then they quickly diminish in output, giving you dimmer and dimmer (and more and more yellow) light for the next hour or so.Requiring no batteries or electricity, these are safe in hostile environments, such as when investigating a gas leak. They're also bright and strong enough to make a good replacement for road flares. They're also handy on the boat for emergency lighting.Everyone should have a supply on hand for emergencies - definitely recommended.

We tried one out just to see how bright it really was. It's impressive. As advertised, the intense light lasts about 30 mins (maybe longer, I wasn't keeping very good track since the kids got a hold of it and ran around the house with them). The interesting thing is that it continued to glow all night long; albeit a lower intensity, but good enough for an indicator; not enough to really use as a light for working. Overall, I'm really pleased.

The white light is helpful to be seen, but classic yellow/green or orange/red are better.Not very useful to see with or use for doing any work or tasks in the dark. Better than nothing, though. Again, the yellow/green is more useful

Activated outside during a snowstorm, around 30 degrees. First thing I noticed was that the 30 minute wasn't any brighter than the 8 hour lights. Was also surprised to see the light still glowing at the same intensity 5 hours later. Worked perfectly fine for marking our location and lasted longer than expected.

Perfect for camping and lighting up a small area at night

Bright, effective and longer lasting than the 30 minutes labeled on the package.I will purchase these again.

These are NOT any brighter than ordinary, very cheap 8 hr glowsticks. Thoroughly disappointed.The sticks aren't even filled half-full! These cost like 10x what cheap 8hr glowsticks do, and the cheap 8hr ones are just as bright...

Note the shelf life on Military Grade ChemLight. I have used and been satisfied with Industrial Grade (8 hour/ 5 year) light sticks in the past but was attracted to the brighter light output of Military Grade without noticing the difference in shelf life. Since these are usually purchased for storage until an emergency arises I can only give the 3 stars.