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Only if the ballast is a multi tap ballast.

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Even if you could install a 120V ballast, or tap it to 120V with the existing one, Current may become an issue. To run the 400W light (sodium?) Now instead of the .833 amp range it's more like 3.33 amps. Supply wiring would have to be able to handle that. Those types of lights are often on long runs to building and grounds lights, parking lots, etc. Using 480 saves a lot on wiring costs.

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โˆ™ 2015-07-15 20:45:05
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Q: Can an overhead 400W light with built in ballast that is currently wired to use 480V be rewired to use 120V?
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