The peep I use has a piece of fiber optic on the back side (away from my eye). It has 4 small dots on the viewable side located 90 deg. apart. It doesn't realy add any light but it does aid in lining up my pin (which is also fiber optic). It really helps me center my pin on every shot. I use it kinda like a crosshair on a rifle scope. Those 4 dots light up fairly well in low light.


Hunt hard or go home !