I had the older style 3d LED Maglite for a couple years and loved it. It was my light that I always had in the truck. One day I set it on the back bumper and thought to myself "I won't forget that before I leave." Well, I did forget that light and it was never seen again. That was about 6 months ago and I finally decided that I missed my Mag enough to replace it. While in the store I was about to get another 3d Maglite but the package said that it throws 364 meters at 131 lumens and the 2d version next to it says it throws 388 meters at 134 lumens. I was scratching my head because they both use the same bulb and the light that uses one less battery puts out more light. I bought the 2d light and I'm happy with it. It's definitely brighter than my old 3d Mag. I was shining it across some fields on the way home with it and lit up the tree line on the other side quite nicely. I couldn't believe the throw on this thing.
I put it up against my Surefire LX2 Lumamax when I got home and it's brighter but not my much. The mag has a tighter spot while the Surefire has a lot more spill.
I didn't even want to put it up against my LED Lenser T7 because the Surefire is a good bit brighter than it is so I know the Mag would blow it away. That would make me feel bad that a $33 light was so much brighter than a $70 light.
So back to my question, why is the 2d Maglite brigher than the 3d Maglite?