greenbeanman, At the factory where I worked before I retired they had many of those high bay sodium lights. We would replace the lights as they started blinking but then after so long on a Saturday we would replace every bulb and start over again. Those bulbs were expensive and some of the earlier bulbs we replaced didn't have many hours on them and would get thrown away with the rest of them. That is the way things go in a large operation.
I never did like the orangish light given off by those sodium vapor lights. I think that they have since replaced them all with a different type. It is an expensive deal just to keep the lighting going.
Another energy thing is to turn the lights off when not needed. They used to have energy management panels with a relay for each light so they could turn the lights off when they wanted to. Then they gave up on that and tore them all out. I liked that system with the individual relays because it was easy trouble shooting when a light ballast shorted and caused all of the lights on that breaker to go out. Otherwise a person has to take a guess at which light fixture was shorted and go up 30' and check if that was the bad one if not move over to the next light and check that one until you found the shorted one. All of this with work stations booths etc in the way below you.
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