@herf I'm new to F.lux and find the tabs very understandable. I wish there were also the ability to add/delete/import/export (and reset to default) new color options in the pull down menu.
I've only used F.lux a short time, and I 've been falling asleep faster since I started using it. I don't know if it's the plaebo effect, but something is working. So I applaud the F.lux team for the this invaluable control panel.