I had hooked a laser to a firearm at work and after shooting about 100 rounds it went dim. The battery and unit, it smelled a little Ozone like.
Not sure what happen, if it was the vibrations or a dying diode.
I have bought a pair of goggles but I think they are too cheap. When I use my blue laser to take pictures indoors while wearing them I end up with a headache just from the reflection.
I am going to buy another $50 pair instead of the $5 pair and see if it improves. I just hope it is not caused...