Is this PWM rate acceptable ?.
” On the driver well it is PWM on the levels but not high as there is no reason for it to be on high. They are 5KHz ”
5khz is acceptable to my eye, but for camera, i dont think it’s suitable
but MCU has developed very fast recently, i think reaching over 100khz pwm is not hard
I see PWM up to 15khz. Not directly but through stroboscopic effect of course. So I think 5khz is not acceptable for >10$ range.
Thanks , I know Reylight mentioned his tool aaa etc was 9khz.
I thought over 16 was better.
the driver should not make a noise so stick to 21kHz or higher
There's just only one “acceptable” PWM frequency: 0Hz.
Bear also in mind that switching the driving devices (regulators, MOSFETs, etc) isn't free, takes time and power. As the frequency is increased, side-effects can appear, as happens with those old 7135s: above ≈5KHz switching frequency and regulation goes down the drain (check this Qlite rev. A -Nanjg 105c- HKJ driver review for facts).
Cheers ^:)
the claw type AMCs do very fine on 18kHz even down to 2.5V, where other 7135s have quite a big deal earlier
this is why I was so pissed when my supplier quit selling the claw type, luckily another seller turned out to have same quality and but with 500 I got shit quality
also in reality 1% PWM cycle on those works quite well, even 0.5%
Even measureable PWM at the LED the driver needs wither switch the battery or burn the additional voltage, so for the runtime switching is better
with AMC like PWM putting a capacitor on the LED output is probably not good to smooth the visible pwm a bit?
Lexel, the real answer to this PWM smoothing endeavour is to attach an inductor in series with the emitter(s), I believe. 
Cheers :-)
alternative facts:
“It is important in lighting design that there is no flicker and that there are no strobe effects. Visually perceptible flicker is definitely a deficiency. But even flicker at high frequencies which are beyond the visually perceptible range should not be ignored. Studies have shown that this type of flicker can have an influence on the human organism.
What do we mean by flicker?
Flicker describes very quickly changing brightness which, depending on the frequency, may be visually perceptible or not. In extreme cases frequencies of up to approx, 80 Hz can be recognized by the human eye which is referred to as flicker fusion frequency. Perceived flicker can be experienced by the observer as extremely disturbing. In exceptional cases it can even trigger photo-sensitive epileptic attacks.”
80 Hz is probably the limit for non moving objects.
When the lighted / lighting object moves, you can perceive PWM up to much higher frequencies.