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This answer to Why are these astronauts green? explains the new (now about 2 years old) solid state (LED) lighting modules being added to ISS interior lighting, replacing the fluorescent lights (see this and this answer).

In video links from the ISS I've only seen neutral white illumination.

  1. Have the astronauts settled on a white or near-white setting (as measured by a meter, our eyes and brains constantly move our personal white-point around) or do they like to operate in Dreamliner mode (also here) and modulate the color of the lighting regularly, depending on "time of day" or some status?

  2. Have there been any health-related directives on recommended color settings, or colors to avoid?

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    $\begingroup$ I would guess they simulate the natural change of daylight color on earth(dawn, noon, dusk). Different tones of white do have different influences such as making tired or awake or drastically changing the appearance of food and therefore influencing appetite. But I couldn't find any sources which talk about the configuration on the ISS. $\endgroup$ – GittingGud Jul 12 '19 at 5:34
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    $\begingroup$ If I was there, I would totally hack up a Christmas light display. Or other national holidays. Guidelines be damned. Good for morale. $\endgroup$ – smci Jan 7 '20 at 10:00

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