I use the word regulation loosely in the thread title. I have a Manker E01 I use as a night stand light for using in a dark house. I confirmed something I suspected for some time, that is that the light output on the the lowest two modes is proportional to the battery voltage. I don't really use the high mode, so I have not examined the performance there. On the lowest two modes the current drawn from the battery is proportional o the battery voltage. Brief chart below
Battery Voltage (V) Mode Current (mA) 1.25 Low/med 3.7 / 82 1.45 low/med 4.7 / 106 1.58 low/med 5.5 / 126
As far as I can tell it does not use a form of PWM for regulation, at least not one I can see. I suppose if the frequency was high enough maybe I would not see it. Anyway I am just curious if anyone has an idea of how the light sets up the three modes.