Awesome Secondary Lighting Idea!

barbagris said:

I'd say - based on the JWS light patterns - my confidence limit is about where the show the border of 0.5lux.

Is there uncivil twilight I wonder? - I wonder how much light one needs not to identify as such but to detect movement. I often find I "see" things before I know what they are.

The JWS (and converted fogs) have simply removed any nocturnal speed reduction for me. I can ride as fast as I normally would by day. Must make another set or buy some long range ones like ones I made before.

Like the two square bits in this foto

Click to expand...

Heh heh heh No uncivil twilight, but there is Nautical Twilight and Astronomical Twilight.
Object motion does indeed improve detection and reduce PRT distances over a stationary object.
All human factor studies in this are done in areas with no measurable ambient light, so they are conservative.
I believe your .5 lux is ambitious, and especially so if your eyes are not good, as you have said.
3.2 lux is considered the threshold for detection and identification. Decision and response then follow.
This would put one at less than 100 meters at low beam and less than 115 meters at high beam according to the JWS chart.
Bear in mind this is for a neutral contrast object (medium gray). if the object contrast (dark clothes) is less the recognition distance reduces.
Size of the object is also a factor to be considered.

Testing has shown autos with 9000 series lights will outdrive their lights at about 50 mph.
Motorcycles are by far the worst, testing with only 70 to 100 feet average recognition distance.
Considering a PRT would be 1.6 to 2 seconds, obviously if one is at 50 mph (73.35 feet per second),
there would not be enough time or distance to stop or avoid a hazard.

My eyes are simply OLDER. My min/max exit pupil capacity is not what it was.

Long sighted - I'd say I can detect/identify somewhere in the Green bit - certainly past 100m.
Reactions - above average according to recent driving licence renewal tests.

Can I tell if it's a Merino sheep or Alcarreña sheep? - No - but that's simply because I wouldn't know anyway.
Can I tell if it's a sheep or a dog? - Yup.

I have some personal opinions on how the human eye reacts in certain lighting conditions.
Certainly NOT like a camera. It does not average out. On the whole I'd say it's very hotspot oriented.
So by this I believe that the more homogeneous you make the intensity of the light your eye receives reflected back from the "target" the more likely you are to "see" it.
The JWS have a dark patch close in - and I've already made sure it's filled in. I could use more long distance - but then I'd need to raise everywhere else as well.