As to higher output with an RCR123A, they still rate V10R at 210 lumens with an acceptable voltage range of 0.9 to 4.2 volts, exactly the same as the M11R specs are claiming (and we know how the V10R rocks with a rechargeable), so I'm certainly hopeful.
The M11R XML-U2 is rated:
180 lumens with a CR123
230 lumens with a RCR123
The V10R XML-T6 is rated:
160 lumens with a CR123
460 lumens with a RCR123
The M10R XML-T6 is rated:
160 lumens with a CR123
210 lumens with a RCR123
The V10R XPG-R5 is rated:
210 lumens with a CR123/RCR123.
The V10R listing on Sunwayman's website is for the
XPG-R5.
They don't have the V10R XML-T6 listed on their website.
However, the specs are printed on the front of the box,
and are also listed on any of the retailers websites.
"Up to 460 lumens when use 1*16340"