While we were talking Jeeps and offroading, my buddy noticed that the advertised light patterns for the Rigid Dually and Dually D2 LEDs are not to scale in a linear fashion - so the patterns that you see in the .pdfs don't actually represent what the real light distribution looks like in spread or distance. You can see from the scales on the advertised diagrams that they aren't spread out evenly and they are actually terribly misleading.
Here is a .jpeg that has reduced and/or stretched the light patterns along a true linear/horizontal scale to show what the actual light patterns look like in both distance and spread.
See how different they are from the advertized patterns? Interesting stuff!
Happy LED hunting.
Note that the units are in Lux. One lux is equal to one lumen per square metre.
0.27 lux is equal to a full moon on a clear night. Therefore, IMHO, the dark red pattern at 0.25 lux can be pretty much disregarded.
1 lux is equal to a full moon overhead at tropical latitudes.
50 lux is equal to family living room lights.
100 lux is equal to a very dark overcast day.
320–500 lux is equal to office lighting.