If you'd like to add a little more foreground flood for the off-roading, get some typical "invisible tape" (the stuff you use when wrapping presents in gift wrap), cut a piece to cover approximately the bottom 1/4 of the lens, and stick it on there. Awesome budget diffuser material

The front of the flashlight unscrews from the body, and you can remove the collimator by unthreading the plastic retaining ring behind it, if you want to get the collimator out so you can work on it easier.