The most fun I'm currently having with a 2D Mag isn't really much of a mod at all /ubbthreads/images/graemlins/wink.gif Get a
6AA adaptor from Electrolumens, that lets you put 6 cells into a 2D cell body, and then get a 4 cell "magstar" bulb and put it in there /ubbthreads/images/graemlins/wink.gif That overdrives the bulb a bit (yes I know, shorter lifespan but since the AA's have more resistance internally than 6D cells and there is some in all the extra connections of the adaptor you're probably running just a little over 1 cell extra) the output is very impressive. There is also a 5 cell bulb, or so there is a rumor about such but I've never seen it. That would let you only slightly overdrive the bulb and it would last longer. Even with the 4 cell bulb I expect many good hours of life from it.
I tried a 6 cell bulb, but the output just wasn't that different from a 3D light with a magstar bulb in it. The 4 cell bulb is much more fun /ubbthreads/images/graemlins/grin.gif
Better get an extra bulb anyway though...