Actually it is the L1D (1xAA) and L2D (2xAA) I still use - I have two bodies for each length, but use the same head. I also have a LD20 which is the improved model, but the threads are different so it doesn't fit with the LxD bodies.

When on extended night rides I use both the L2D and LD20 set up below bars on each side of stem. Usually I use one at a time and switch over when one runs out of battery, but use both when I want more light.

Here is the L1D on commuter: