My Ultrafire F13 mod thread

OK guys, so my F13 mod is pretty much finished. I’ve enjoyed it and like the results quite a lot.
I want to try again with a different but similar light, I essentially want one that is not so throwy. This F13 is nice, but if I could get a bigger hotspot with more flood that would be great.

So quick question (don’t think this deserves a new thread)

Trustfire A8 and Ultrafire F15 are pretty much the same light apparently, but the A8 comes with a smaller 25mm reflector, while the F15’s reflector is 30mm. Are those 5mm going to make a big difference in the size/spill of the hotspot? Would it work if I put a narrower than 30mm (orange peel) reflector on the F15 to increase flood, having the reflector push directly on the lens maybe?