Just wanted to drop a quick heads up. I keep a 4D cell maglite in my truck at all times. My Surefire is brighter, but I don't just keep that light there for light. Anyhow, while picking up a box of WWB at Wally world I stopped to look at their light display and Maglite is now offering 3 watt LED coversion bulbs for the 2 and 4 cell Maglites. I picked one up for just under $20 and it burns with a bright white light, probably a bit brighter than the original bulb. A bit pricey, but factoring in the massively extended battery runtime, well worth it. The batteries will still go dead just as fast if you don't use it, but if you have to use it, they'll run much longer.