Headlights must be activated when visibility is limited to:
https://www.puedomanejar.com/en/dmv-questions-answers/headlights-must-be-activated-when-visibility-is-limited-to/
In most states, you are required to use your headlights between sunset and sunrise (or 30 minutes after sunset to 30 minutes before sunrise), as well as times when visibility is reduced. Again, in most states, the threshold for reduced visibility is 1,000 feet or less (some states place the limit at 500 feet or less).
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