So I see a HPS light outside my apartment building flicker (seemingly dims for like 10ms maybe; noticeable); why?? I smoke, so I'm out there to see it like 2-3 times at night (bad I know...). Happens at least once a night though. Is it a cheap transformer in the ballast? Is it the power fluctuating every-night when I'm out there?? Is it in my head??? Thanks for ideas!!