I believe he's true. At some point, as long as your rear light is reasonably bright enough that the driver can see you from say, 500-1000ft back, you're fine. Is there any reason why a driver needs to see you from 20,000ft back?

I'm gonna pull off a wildassed example of "less is more". I did an investigation for a steel manufacturer. It turned out, they were copying some design properties from another manufacturer. The 2 of them kept reverse engineering each other's products. As one company adjusted their formulation of carbon to get more carbides into their steel, so did the other. One day I got this sample that showed ridiculous amounts of carbides under the electron microscope and it performed really poorly in the notch impact testing. What happened was that they kept borrowing each other's "more is better" mentality and dumping way too much carbide in it. Eventually, it brought the toughness of the steel way down in the saw blade and the thing kept breaking its tips off.

Just saying, the goal is to be visible at a reasonable angle at a reasonable distance from the driver. Not be visible within the next 10 miles of air space and land 747's along our route.