Although it is a nice idea, i doubt that it is very reliable. For instance you claim that a person could safely travel at nearly 23 mph with a Cygo lite Night Rover 12 watt. I have two of the 16 watt systems. I wouldn't even think about traveling 23 mph in the dark with just one. That would be very dangerous as it doesn't light near well enough.
I am currently running both systems at the same time which gives me 32 watts and I am not even sure if i would want to do 23 mph with that. I know that your guide is just a rough guestimate but I don't want people to rely to heavily on it.