I have a Bushnell Dusk to Dawn MLer Scope and you do what Dave mentioned above about shing the light into the Bell to charge it up. I never really use the Illumination as if you need to see what your aiming at it's usually past legal Hunting time anyway or too early to be shooting. The scopes light gathering capabilities are plenty enough to gather light when needed.
My one buddy has a red dot (I think it's what it's called) he really likes it, no cross hairs just the red dot, it is battery powered, not the kind that just has the dot.
(BP)