Amen, RC. I can't for the life of me relate to someone with a knife who says, "Why would I need a flashlight?" I would be equally at a loss if someone who carried a gun asked me what possible need he would have for a knife. You just don't know where to begin. I think a number of people have made a decent case for it. The question is, will it get anyone thinking about it?
[BTW, how did you deal with your M16-13M's chisel grind? I haven't been able to do anything with my CG knives. CRKT told me to reprofile the blade to 17-22 degrees to get rid of it. It's an aside to the topic at hand, but since you mentioned the sharpener, I couldn't help but wonder. I like the sharpener, too.]
Back to flashlights, though. What was your primary reason for choosing a 1-cell over a 2-cell light? Do you use rechargeable batteries? The thing that draws me to the P3D is that, on its lowest setting, it provides more than twice the light of the P2D. You also get an extra lumens burst from a 2-cell.
Years ago, a neighbor, hearing something walking on her roof, called us at 3 a.m. to see if we could see who, or what, it was. I couldn't see anything and told her to call the cops. About seven minutes later, I saw three police cars, lights off, pull into the cul-de-sac. Dark figures spread out in all directions surrounding the house. Then, as if on signal, the entire area (house and yard) was bathed in light. Lots of it. White light, too. It was almost as if it were daylight. Well, they found some raccoons on the roof and that was all, but I always remembered how brilliant the light was. This was back in the days when many flashlights had magnets on the side and were made of plastic, usually of some garish color. Spare bulbs were fifteen cents.
The energy required to light that area must have been enormous, but now LEDs can do the same thing. Taking a powerful light with plenty of sidespill, of about 225 lumens, one can produce that kind of light in a limited area, and they can keep it lit for an impressively long time. Clicking it to a lower setting, and you still have more light than the plastic one, and you can keep it on for more than a day, or two days.
So to not have a light like that seems to me to be a bit illogical, as Spock would say.