with KoReader on Pocketbook, you can have inverted screen (white font, dark background).
Warmth and lowest level frontlight; naturally this is all opinion; but if you generally read using white-on-dark; then it's less important, imo. At that point, I think the next thing that can be mildly disconcerting (at least for me) the full page refresh (if that's the right term); where , at least for me, occasionally the full page has to refresh, which briefly flashes brightly, then back to white-on-dark. Maybe it's my own settings, which honestly, I haven't pursued too deeply to configure better...neither in KoReader nor on the Kobo with the inverted screen choice selected.
I know that doesn't answer your question about frontlight/warm light. But honestly since I switched to primarily using white-on-dark, I don't pay too much attention to my warmth light or frontlight brightness settings, to adjust that interactively.
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