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Is it a sunwayman?
Niwalker 750N???
Hmm, I've been thinking about a G25C2vn if there were any still available, then this comes along. Sounds very interesting.
Using your carefully dropped clues and some searching, could it be a Powertac Warrior?
I AM IN!! Everything will work out w/ my son Capo................."Our serenity is directly proportional to our Acceptance"
Wow! a dome on K40vn is what? About 150,000 Lux? It will be a most impressive thrower. That kind of performance will require a very good reflector. The best reflectors I ever came across back in my modding days were the Tiablo's. I still have 4 reflectors, and 3 Aspheric heads I bought, but never used for mods. I had an A9, A10, and A50. The RRT-1 was a competitor to the Tiablo A9. It has a rubber ring, and is a Tactical light.
A10 then? It was the king in the XRE-R2 days.
Well I hope you didn't throw us off with the reference to RRT-1. Because that light sucks.