The 2-mode Tool that Selfbuilt tested more than a year ago was current controlled, the newer model 3-mode Tool that I tested half a year ago was PWM controlled, with a fairly low frequency. So Lumintop changed that at some point.
It would be great of course if this copper GB Tool would use current control for the three modes, but I guess that would imply a new driver design by Lumintop.
(btw, if this gb works out with this 0.5%-20%-100% driver (PWM or current controlled), I would be interested in a couple of separate drivers for modding, if that could be arranged :-) )