My own experience with light-sticks got me to remove all of them from my kits !
* if you try one you just bought, it works pretty well. But most of the time I wanted to use one after a few months stashed in the car kit or in the backpack, they were dead (even when not time-expired, wrapping not punctured, etc.. ...)
* they are not emergency locators ! A light stick, except on a pitch black night, won't be seen from some distance. Your best chance is to attached one light stick to a yard of cord and make it turn above your head. I can't see you doing this with three sticks at the same time...

I prefer to use flashlights and/or flashers, with extra-batteries : batteries also tend to die on you when you need them. Use lithium !