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Forrest, this has been pointed out previously, as wel as the difference between flourescent and incandescent lighting being different in the appearance of the flicker. To add another factor, i wonder how many PWP's ave received electrical shocks, either as a part of therapy, or accidental exposure during work on electrical devices. I know I have had more than my share of shocks playing with electronics since I was a small child, now I am 53, and so far have no symptoms of any condition. Since my father has Parkinson's I guess I may be somewhat at risk. [OO] LOOKING FOR RADIOS! Ken Becker [log in to unmask] On Thu, 10 Oct 1996, Forrest wrote: > It may be of use to those of you pondering a relationship between the > on-off-on (flicker) frequency of lighting and the way you feel to know that > the flicker frequency is twice the powerline frequency. This is because the > current goes to zero twice in each cycle. Thus, the flicker frequency in > the US is 120 times/sec. This be important if actual times/sec do enter > into the relationship. >