I got one of these 4 packs a few weeks ago at Home Depot when they were clearing out the 4 packs, which I think were a left over black Friday special (Home Depot sells 2 packs of red Nite Ize glowsticks as a regular item).
They have a couple of big advantages over chemical glow lights: one is that they can be turned on
and off at will by twisting the head and the other is that 4 included alkaline AG3 (LR41) cells are replaceable making the Nite Ize glow sticks fully reusable and more adaptable than single use chemical glowsticks.
These LED glowsticks seem brighter than the typical chemical glowstick and have a claimed run time of up to 60 hrs. (ANSI FL-1 Standard). They are also water resistant to 1M, will float (very lightweight!) and each comes with a little plastic Nite Ize S biner.
I kind of expected the red LED to be a bit dimmer than the blue and green LED's based on experience with colored Photon lights back in the day, but actually the red appears to be slightly brighter if anything.
These seem like they would be great for finding your pack or tent when camping, keeping track of kids and other members of a group after dark (different colors could help identify who is who at a distance). They are are even bright enough for reading if you hold them fairly close to the page. These should also be good for being seen when walking or biking at night.
Size comparison with a Sharpie and a AA cell:
I have not tested the run time or had to change the batteries as of yet, but if anyone is interested in how it's done, here's a Nite Ize video on showing the battery change with the aid of a jeweler's Phillips screw driver:
AG3 (LR41) alkaline cells can be had for good prices on the net. Silver oxide chemistry cells of the same size, such as Energizer's 392-384 should work also with about 25% longer run time, though these generally cost more than the alkaline AG3's.
So far I am liking these Nite Ize glowsticks; they are bright enough, light enough and inexpensive enough to be viable replacements for single use chemical glowsticks, with the huge advantages of being able to replace the batteries and turn them on and off whenever you like.