2011:
I recently repaired an Original RRT-01 that has this driver, marked RRT-01 2011 (no strobe):
the 2011 RRT-01 box claimed 500 lumens… I verified that light did indeed reach 510 lumens, momentary maximum, on my meter
2012:
during the group buys last year, of Original RRT-01 from Australia, that RRT-01 driver was in some of the lights
and the Eye10 driver, with the date 2012 (yes strobe) was in some of the other lights
the new packaging in 2012 claimed 600 lumens… I have not verified
I did verify one of the 2012 RRT-01 that came in a box labeled 600 lumens, actually produced 460 lumens, not 510, and not 600. The light was one with no strobe. That tells me it had the 2011 driver.
the above lights all came with XM-L LEDs
based on what I have seen, some of the 2011 drivers went into the 2012 lights, so there were at least 3 different batches:
2011
2012 w 2011 driver
2012 w 2012 driver
2019:
when the 2019 model came out, it had an XP-L LED
it also had the 2012 Eye10 driver (supposedly with a resistor change to allow higher output):
packaging claims 950 lumens, I have not verified. Ive seen a couple tests reporting about 700 lumens.
whether the increase in lumens was due to an LED change, or a resistor change, or both I dont know
2020:
now Jchang reports his 2020 RRT-01 also has the driver marked 2012 Eye10 (presumably from the 2019 run)
from this I infer that some 2020 lights are using the 2019 driver (marked 2012)
iow, Jetbeam sometimes releases a new model, but installs remaining drivers from the prior model, in some of the lights, but not necessarily in all of them.
So, I would not be surprised if some of the 2020 RRT-01 transition to a driver with different marks than the driver in the 2019.
talk is the 2020 driver is marked RRT-01, and has thermal regulation. I have not seen a photo of that driver yet.