Here is a compilation of the 2D, 3D, 4D, and 6D Maglites with the Malkoff drop-in running on Titanium 12000MaH NiMHs.
Again, the 2D Maglite seems to be a "Best Value" for runtime and brightness.
..........
I did something interesting here, I calculated the area under each curve to get an idea of how efficient each config is. I used the NiMH chart.
Then I divided that number by the number of the cells in the setup.
It does confirm the obvious that 2D gives you most lite - less bright but longest runtime.
But it also suggests that there is no huge difference in efficiency between 3D, 4D and 6D configurations. It looks like sorted by efficiency we get:
2D, 4D, 3D, 6D
2D:
149/2 = 74.50000000000000000000
3D:
132/3 = 44.00000000000000000000
4D:
199/4 = 49.75000000000000000000
6D:
245/6 = 40.83333333333333333333