how long do those light stick last?

[picard]

how long do those light stick last? 2-3hrs?

 

[Sector7]

The ones I've seen for professional use are around 8 to 10 hrs average.

 

[baterija]

It varies based on color and size. There are high intensity that are good for less than an hour, and others that are rated for 12.

Here's a link to Cyalume showing their product. Under each product type there are rating based on color.

 

[curlyfry562]

Generally they are 12hr, but you can get ones that are 8hr, 30min, and the orange ones are usually the ultra bright 5min.

Here is where I get mine:

http://www.nitro-pak.com/index.php?cPath=28_68

Two suggestions if you are ever somewhere very dark with a lot of people, chop off the top of the light sticks and have 'light stick fights" . So much fun, every one glows for an hour or so, and at least the ones I have used, don't hurt your cloths.

Another fun thing to do with glow sticks is make dry-ice bombs filled with glowstick goo. I looks like a fire work when it goes off

 

[broadgage]

The stated run times are at normal room temperatures.
High temperatures give a brighter light for a shorter time.
Low temperatures extend the run time greatly, though with a much dimmer light.
The output of a light stick appears to decline exponentialy from the moment that it is activated, and it still gives a very little light after several days, even a week or two in extreme cold.