We support UPnP as a fallback - if the meethue list is empty it should definitely use it. If you have a mix of "real" bridges and emulated ones you can disable meethue entirely using:
HKCU/Software/Michael Herf/Flux/Preferences/meethue = DWORD(0) in the registry.
We could probably add manual IP entry in the future.
Here is an example for what happens when using "blue light hazard" metrics with LED to OLED.
Here's an iPad Pro:
https://fluxometer.com/rainbow/#!id=iPad Pro/6500K-iPad Pro&action=BlueLightHazard
An iPhone X:
https://fluxometer.com/rainbow/#!id=iPhone X/6500K-iPhone X&action=BlueLightHazard
The second screen would be "safe" according to one industry standard, but the change is only 13% less "hazard" light with the second spectrum.
But because these things happen over orders of magnitude - if there is a problem, you want 90% less harmful light or 99% less, not 13%.
Dimming your screen can do this kind of thing (and f.lux can do part of it too).