Hi beav,
I recently designed a reflector for the Cree 7090 and it works well with the Nichia Jupiter as well. It works better with the Jupiter that doesn't have the integrated lens of course.
If you want to use the Jupiter with a reflector, the typical challenge will be in aligning the LED with the focal point of the reflector. If the focal point is within the reflector, the LED will need to be placed within as well which usually means a pretty big hole!
The 19 mm reflector I designed and now have (soon available from the shoppe) has its focal point behind the rear of the reflector and in fact it will seat down on the Nichia for a good alignment. I plan to use the reflectors as well as the Nichias for some fixed lighting fixtures still in the works.
Over all,I like the Nichia but I must warn that white wall hunters will see the Jupiter as a step back to pre EOS Lumileds history. You will find a disparity in tint typically ranging from a warm white in the corona to a bluish white in the spot beam with a reflector. In actual use, this inconsistancy in tint is not a big deal, IMHO.
