[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: re Re: Headlight Hype? or Facts


   Well, with 5XX Phil Payne watts shining forward, one is likely still in the
   photopic (daytime) mode.  :-)   More to the question, if one plots the
   logarithm of threshold illuminance of the eye versus the logarithm of
   background luminance, the curve is not perfectly linear.  However, the
   photopic portion has roughly a slope of 1, while the scotopic portion has a
   lower slope.  I interpret this to mean that the minimum illuminance I can
   detect doesn't increase as quickly as the background luminance at night.
   Conversely, as the background luminance decreases (gets darker), the
   improvement in sensitivity does not keep up (eye is worse than one-to-one


Sorry I asked <snicker>