Just as the title says, I ordered a few 50mm lenses from DX and I was wondering if using them with a reflector is a common practice, and if it isn't why not?

I intend to use it in conjuction with the P7 drop in they offer and it should sit roughly 1/2 from the emitter, my caliper battery died so I cant get an exact measurement.

I am trying to maximize throw from this light, right now there is a good amount of spill on the edges and if I could get that light into the hot spot I know this thing would be insane.