Some chemlights have issue where they turn off even 1m away from player,this issue started since the Visual Update,never got fixed. I like Yellow Chemlights they are fine. But Blue is the worst than red,and than green needs to be sorted. Yellow and Red have glow even when glow around them is gone,witch is fine,you can spot them.

https://media.giphy.com/media/26FLdrBQEnk2yz0ju/giphy.gif

https://media.giphy.com/media/26FKSbEWncNSdJSOA/giphy.gif