Originally Posted by
Looigi
Rods vs cones and all that, but I was of the impression that typical night time driving/riding luminance levels didn't get down to that level, but I image they can, I guess, certainly in the distance where luminance has fallen off.
That's the point... hazard detection occurs on the fringes of darkness, especially with a bicycle headlamp. Those luminances are certainly in the mesopic range, although not likely to be in the scotopic range.
Typical roadway lighting does get into the mesopic range, so even running with a headlamp and some form of roadway lighting, you are still probably running in the mesopic range.