A flashlight has a lens or lenses moveable relative to one or more LED or other light source. The beam of light provided by the LED can be focused and provides a uniform light pattern across the range of focus. The lenses are supported on a front housing section and the LED is supported on a back housing...http://www.google.se/patents/US7083299?utm_source=gb-gplus-sharePatent US7083299 - Flashlight having convex-concave lens
