I recently installed nitesiters onto my FNP-45 and honestly do not know what to think about them. I was very pleased once I installed them (the nitesiter dot fit perfectly into the front blade sight, but had to be trimmed to fit into the rear sights). I have a coast v2 5 led flashlight that I used to charge the sights for a couple minutes and was pleasantly surprised by their brightness in a dark room. BUT, after leaving the pistol under a bright lamp for an extended period of time (at least 30 min), i took the pistol back into a dark room and there was almost no glow... Next, I left the led light on the sights for an extended period of time and the same thing happened... I'm wondering if it is possible to overcharge these things; they seem to work best with a quick charge and do not glow for an extended period of time. I'm sure dave from nitesiters will see this at some point, so do you have any pointers? Don't get me wrong, these things glow like crazy with a quick charge. Ill be taking them out into the field next week to see how well they work overnight.