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.
I am assuming that these are still the type of lights used to illuminate most outdoor sporting events.
“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
You’re assuming that they are all installed at once, which is incorrect assumption #1. Also, just because the equipment may have been installed at the same time, doesn’t mean the equipment is the same age (I.A. #2).
As the ballasts that control the luminiere age, they will take longer to reach the correct start-up temperature. This would cause the scattered lighting-up effect.