I've been trying and comparing various Cyalume glowsticks for a while and here's what I found: 1) They've always lasted longer than 12 hours (about 10 - 12 hours of good light, tapering to 24 hours or more at 73F) 2) They give off a green light that's slightly different from their 6 inch glowsticks, that's really important 3) If you're looking for a one-way emergency light Night security source, I think this is a good choice. Colour). The chemical reaction in the cloud is certainly faster and therefore emits more light per unit liquid. However, since they are larger, the light output to the naked eye was about the same. After about 4 hours the alternate torch started trailing behind those 12 inch lanterns that got stuck at the exit. Don't get me wrong, flashes are good for what they do, but they provide usable light over a longer period of time.
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