Testing f.lux that adjust color temperature of the display

Trying out a tool called f.lux that adjust the color on the computer screen so that the eyes don't get tired so fast when working late evening/night. I found the tool in Scott Hanselman:s ultimate tool list so thanks for sharing. Worth trying out when working late during the winter month. I must admit that I've started adjusting the brightness on the phone and surface after using f.lux a while, because I felt the brightness was too bright for my eyes.