Don
It looks like I may have get my Oscilloscope out of the loft and rig up a sensor circuit to test this out. The Boss has jobs for me at the weekend so it may take awhile.
Another thing to think about while on the subject. If the brightness of the flash was to change then also would its colour. The brightness is very much down to the voltage on the capacitor at the time of discharge. As the batteries age then the Voltage would be a bit lower.
I see on the recent models of Canon flash 430EX & 580EX they attempt to compensate for this by telling the camera what colour temperature to set the camera to.
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