I added a Trijicon front sight to my SP101. When it's dark I can see the front sight just fine but not the rear sight. That got me to thinking... what's the point of having glow in the dark sights if you can't see your target? I like the design and shape of the Trijicon front sight compared to the original, but it isn't very bright in the daylight when "I CAN" see my target. So I put a dab of lure paint on it and it is now a useful sight. I wrote it off as a "lesson learned".