Bull's eye! I was waiting for a very smart person to mention this point. A point that I suspected but could never explain. The light source was the common street light you mentioned. Jim ----- Original Message ----- > > We played football on the canal again last night under some nearby > street lights. It was interesting to see the difference in the visibility > of the kayaks. Yellow was by far the most visible. > Also the spectral characteristics of both the light source and the receiver > (=eye) are important. > > The human eye is colorblind at low light, as well as being much more > sensitive to red and yellow. > > Streetlights, in particular the common orange low-pressure Sodium ones, only > emit yellow light , so everything else looks dark. > Kees *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Thu Oct 24 2002 - 09:40:36 PDT
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