I see there is some fluctuation of the output of the sc5fc, but it isn't pwm and more importantly, the fluctuations are said to be so low they can't be seen by eye. I don't know the absolute scale of the scope diagrams, but if say the light fluctuates between 100% and 90% that won't be noticable and has no notable impact on effeciency, so for all intents and purposes it has no PWM. Other lights like for instance the Fenix LD60 should be constant current but there the fluctuations are so great it does cause visible flickering which is as bad as having PWM.true, the PWM weasel clause applies to Zebras. They use Pulses that are not PWM by technical definition, since the Pulses do not drop to Zero.
However the fact Zebras do not use PWM does not mean they use Constant Current. In fact, Zebras do NOT use Constant Current.. clic pic for more info
This should be a list of lights with no visible flickering (although extreme high frequency PWM should still be counted as flickering)