I have a Mecarmy PT-16 that accepts not only CR123, but also 16340, and my favorite, 18350.
You would need to swap LEDs. In my limited experience, tripples with optics, have floodier beams than single LEDs with standard reflectors.
Mine was modified to 4000k N219b with LEDs from illumin. I love the pink tint.
Clemence also has some outstanding N219b.
see this post for pics and how to get one for $45
I get 1000 lumens from the 18350. The other modes are approximately 5-50-200… it also has a great, simple UI, with direct access to turbo, momentary turbo, and strobe…
4000k N219b on left, 6000k XPG2 on right (stock)
also more info in this thread
fwiw, the PT series is fully flat regulated output, no PWM, no Circuit Noise, no wavy gravy
otoh, they have no pocket clip, and no built in overdischarge protection