I also like the Inova. The lithium batteries last a long time, and don't discharge when not being used. You can get them in bulk, by the dozen or so, from several places online, at a very reasonable price. They last for 6 months or more for me, though. I would recommend an LED light no matter the brand, though. They use less power, and produce a lot of light. You can get bulbs up to 5 watts if you want, and there are drop-in models available for most popular flashlights, including all the MagLite models, even the big multi-D cell models. The white LED light is great for preflighting, and I can see oil levels much easier in it than in the yellow incandescent light from regular bulbs. I don't much like focused beams like MagLites, though, preferring a more diffused, unfocused light from the Inova. The more spread-out light lets me see more than a tightly focused beam which only lights a small area.