In message , The Natural
Philosopher writes
My own control system for RGB colour changing uses a PWM frequency
of about 350Hz to avoid flicker.

Sill get strobing effects.
Most disturbing.

Only if swished back and forth vigorously to make the effect visible.
Still less than a traditional fluorescent tube or discharge lamp by a
large margin.

--
Clive Mitchell
http://www.bigclive.com