[crazygringo]

2) Everybody says not to use it for graphic design... but I haven't found any problems. I think my brain judges colors relative to whatever the "white point" is, and there is always enough white/gray in my OS interface to judge photos or artwork alongside. Remember, color perception is fundamentally relative. When I look at my work the next day, it looks just like I remembered it. But other people have found the opposite, though -- it may be a personal thing.

3) It's not about brightness, it's about color temperature. If you have fluorescent lights in your office that are on at 10pm, you're right, it's not going to help. It really only makes sense to use F.lux under non-super-bright warm-ish nighttime lighting, or in a dark room.