It should work fine. The phototransistor does have some sensitivity in the
blue region. It uses a fast comparator circuit (with a little hysteresis).
One input is the average/filtered phototransistor output, the other is the raw
signal. It can detect the PWM signal from a small flashlight (a couple of
lumens) in a room lit by 10,000+ lumens of overhead LED lighting. It can also
detect the light output fluctuations caused by DC-DC converter switching.
---------------------
What would your PWM sensor circuit do if all of the AC was in the blue, and the
white light appeared as a DC bias on the phototransistor?
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