I had for the longest time carried a mag solitaire. As my keychain bulked up (as a result of reading too much here), I had to examine the items there for size and weight. I converted to an ASP saphire light. This light is really easy to detach ( it works like a gate-mouthed mini-carabiner) from the keychain, bright enough to read, walk, cook by, much lighter than the solitaire; the down side is that this light has a momentary pinch switch so it is difficult to use hands-free A mini binder-clip works really well to hold the light on and provides a stable stand to hold the light to your cap or in position on the table. In my EDC I also carry a AA mag light, and a photon II and a LED light that is built into my mini-multi-tool from Dakota.