Why can't they use candlepower like civilized people?
In passing, I note that 1 candlepower = 0.981 candelas. That's about a tenth of the acceleration due to gravity, which is why dynamo lights get brighter when you're going downhill.
I thought it was because as I travel faster I catch up with the photons, de-facto concentrating them/squashing them together to provide a more powerful illumination relative to where I am at the time they do the illuminating (as against when the photons were released)...
By the same token, the faster I go, the younger I become. Unfortunately this is offset by riding further, which has a much stronger aging effect.
Next up: How Audax and the Space/Time Continum, i.e., How carrying a Brevet warps space-time, so it's always further/takes longer then you think....