I use f.lux, but I wish the transition were slower; I want it to gradually change color over the course of noon or 3 pm or so to sunset, not the 20s or 1 hour c

I use f.lux, but I wish the transition were slower; I want it to gradually change color over the course of noon or 3 pm or so to sunset, not the 20s or 1 hour choice that it currently has. But otherwise, it's a nice program and does seem to help, although I'm sure everyone will have varying levels of success with it.