“Why is it when these type of lights are shut off, they don’t all come back on at the same time. I would assume that most of the time they are installed all at once, so they all should be equally old.”
Different concentrations of mercury vapor? Different temperatures? Different locations on the circuit? All of these things can play a bit of a roll…
“I am assuming that these are still the type of lights used to illuminate most outdoor sporting events.”
Actually, I think xenon flash tubing is beginning to take over.
“All I say here is by way of discourse and nothing by the way of advice. I should not speak so boldly if it were my due to be believed.” ~ Montaigne