Cheers for that. I was hoping for brighter, but if that's the best you can get from a drop-in then I understand there's an effort / reward payoff.
You could extend it with this:
http://thetorchsite.co.uk/XCapeCap_Maglie_D_Cell_Tube_Extension.html
So, it becomes a 4 cell, then use the following to make it a beast!
http://thetorchsite.co.uk/TerraLUX_TLE-310M-Ex_MiniStar31M-Ex.html
I have one of these on a 6 D cell mag, its awesome. It stays at home for emergencies, and I have 18650 torches for uber power!