Today my wife and boys surprised me for Father's Day and we went to Crystal Cave http://www.acoolcave.com/ in Spring Valley WI. Since I didn't know ahead of time where we were going I didn't have time to plan what lights to bring with on the trip. Fortunately, my wife's Inova T4 http://www.inovalight.com/ was in the van and I decided to bring it on the tour just in case we might need it. The tour was fun and interesting. Shawna, the tour guide, used a 2D MagLight to point out special features. Man was it lame. My Inova T4 light was much better for looking at the caves features than the MagLight. I am just curious, if there are any cavers or spelunkers on this forum, are there any preferred flashlight for the hobby? I realize the one rule of thumb is to always have a minimum of TWO lights for the hobby, but I haven't ever heard of which lights are most suitable for exploring caves.