It's very interesting, but a complicated set of questions, so hard to respond to.

One additional piece of information I would like to toss into the mix- What is the light spectrum of the various sources of light pollution? For example, say a plant grown in a highway median gets exposed to car headlights all night, what does it do? Flower normally? Go herm? Fail to set bud? Compared to a plant grown at the edge of a parking lot with light from a distant HPS...