Ok so I sent an e-mail today to BOG asking about the R2 on the side of the box here is a quote of the e-mail
"the light you received was the last R2 we had left from a special run of R2ST's"
Well thought that was pretty cool anyway.
As for the buzzing sound, that is likely inductor whine (it is not related to PWM - current-controlled lights experience it as well). It is highly variable and hard to predict - but if your light has it, you are stuck with it. I've had the occasional light that was quite loud on some settings on some voltage sources.For example if I am in mode A and program to any output level instead of programming mode A it programs mode B. Same for mode B it will program mode C.
Their is also terrible PMW buzzing sound on all outputs except the max output.
Also I didn't expect the rather purple tint.