Where I worked, they had metal halide pendants inside. They would be bright and seem normal. Than, I'd come in one day and one would be dimmer and pinker. It would run like that for a couple weeks, than go dim orange. It would run like that for a day to a week, than would be completely out. They where also run 24/7/365, but they are cycled a couple times per night to indicate alarm breaks.
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