[obsoquasi]

What if you put an aperture in front of your light to let only a central area through? You loose a lot of light from the strobe, but it will be more like a point source. 

A simple try would be aluminum foil where you cut a hole in it.

I like that idea!! What I am going to try is to actually use the protective head for that - including a piece of foil with a aperture hole in it. I guess I just have to be careful not to overheat the unit. No modeling lights! Thanx, photonius!