On Aug 23, 9:50*pm, The Natural Philosopher
wrote:
i can see flicker on striplights at 100hz.

That's extremely unlikely:

http://en.wikipedia.org/wiki/Flicker_fusion_threshold
http://www.scholarpedia.org/article/Flicker_fusion

It's much more probable that the light in question had a component of
flicker at 50 Hz, due perhaps to distortion of the mains waveform or
some characteristic of the light itself.

Richard.
http://www.rtrussell.co.uk/