Last year I had a middle of the night "event" that included presenting my P-07 with a light outside of my home. It was quite the learning experience. Aside from issues like readiness/alertness/adrenaline, it became immediately obvious to me that with the light on, the sights virtually disappeared. The sights in question were reasonably fresh Meprolight tritiums. At this point, I'm firmly in the red dot sight camp for HD use. Even with an rds, you have to make certain you set the dot bright enough to overcome reflected light and eyes that haven't adjusted.