Should I get MCR-19XR, MCR-19, or MCR-20?

[farscape105]

I need reflector for my cree modified QIII. Saw these reflectors at Sandwich Shoppe and want to know which would be best for nice hot spot. I could probably make any of them fit. But want to make sure cree fits without having to dremel the opening. I tried an IMS20 and had to dremel out opening and I the beam has artifacts.

 

[cratz2]

I believe the 19XR is designed for the Cree. I think the beam in your modded QIII has artifacts more because of the design of the reflector than the opening size or exact focal distance of the LED within it.

Seoul LEDs seem to work a bit better (artifact wise) in reflectors originally intended for Luxes.

Have you tried a 3.7V R123/LiIon cell in your Cree'd QIII?