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> turn the timer switch on for 30 minutes of a properly calibrated and positioned low-dose UV light (and out of direct line of sight to anyone not under it)

Gosh. Or just go outside! It has the added benefit of being somewhat enjoyable.

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Or gosh, just read my comment! I said in somewhat gloomy places. Sometimes people are working when the 10 minutes of sunlight comes out. Often that's not enough time to get down the elevator and get outside before the sun hides behinds the clouds again, even if you can take the daytime break.

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