In order for a lumenock to activate, you must back the nock out just a hair.. back it out of your arrow that is. Over time, the back end of your arrow, as well as the nodes that protrude to be pushed forward and down to complete that circut wear down. Some are stiffer than others.

My experience with lumenocks are that they are roughly 75% go and 25% no-go. A whole lot of it depends on the kind of arrow you shoot, and how much arse your bow has.

I've been shooting tracers all summer.... and have yet to have one not light up. You do have to check them right out of the package, because you will have some that are duds... but if they light up once... they will light up til the batt quits... I have one that I have well over 500 shots on.... still going... not as bright as it once was... but still working like a champ.