F.lux is great, and seemed to be very effective for me. However, it appears that you still can't postpone color change until a specific time I want my monitor staying at 6500K until around 8 or 9pm, year-round. F.lux leaves me sleepy by 6pm during the winter months.
You could change the settings to a location at the equator, and maybe one or two timezones to your west. (I understand that having more customizable settings would be a better alternative, but I thought I would offer up my hack).
