If the lighting was built before 1980, you have to pay close attention to it. Most older light ballasts may have contained polychlorinated biphenyls (also referred to as PCBs).
These are the things to watch out for:
– Light flickering
– Buzzing noises
– Low light output
– Inconsistent lighting
– Delayed lighting after being switched on
If you’re throwing out some lights or renovating a home and don’t want to waste everything that gets demolished, you may look at a light and wonder if it’s worth it.