Pretty much as my answer to a related question:
As part of the experiment, the crew of the ISS are subjected to the Dynamic Lighting Schedule:
- Have the astronauts settled on a white or near-white setting ?
Pre-programmed and pre-planned with 3 lighting values:
Three pre-determined light settings are envisaged for use in different operational settings. Specifications for Correlated Color Temperature (CCT) and luminance in candelas (cd) settings:
- a General Illumination setting - 4500 K white light, 210 cd.
- a Pre-Sleep setting - 2700 K (blue-depleted) white light, 90 cd or ideally lower.
- a Phase Shift/Alertness setting - 6500 K (blue-enriched) white light, 420 cd.
As you can see, its pretty much a variation on white...
Those green-tinted pictures seem to be system LED unrelated and might just be them having fun with cameras and remote strobe/gels.
- Have there been any health-related directives on recommended color settings, or colors to avoid?
I think it is less about avoiding colors and more about regulating the timing of the blue emanation from said light sources.
“While the multi LED system can provide millions of different light spectra, we plan to use three settings for now,”
“A high-quality daytime light to help the crew see well, a higher intensity blue-enriched light to boost alertness or shift circadian rhythms, and a lower intensity blue-depleted light before sleep.”