On Tue, Sep 18, 2012 at 7:49 PM, Morris Odell <vilgo...@bigpond.net.au> wrote:
> The discussion about LED flicker was interesting. As I understand it the > human eye can act as a peak detector Actually the rods and cones in the retina only respond the changes in brightness. the eye constantly moves so that the image always changes. It works this way because we needed to see only edges. We don't see 120Hz as flicker but still it stresses the eyes and visual system. If you think of the eye as being "AC coupled" to the brain it is easy to understand why to fast to see fast flicker is fatiguing. Back to noise in the lab: As I wrote a while back if you want efficient lighting that is "radio quiet" all you have to do is shop in the right store. Much of the lighting used in ocean going sail boats is "quiet" because these boats will cary HF and VHF radio, GPS and radar and run off battery power. But don't expect radio-quiet cold cathode fluorescent lamps made from power coated stainless steel to be cheap, you pay for the quality. Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.