Heh.... I just discovered my monitor has a built in colour temp control. It was set to warm. Setting it to cool (combined with f.lux) results in a far nicer screen Smiley

EDIT: Which is bizarre, because warmer is supposed to be better in artificial light... I think it's that setting the colour as "cool" seems to dim the brightness for some reason (despite the fact that brightness is already at "0" Perplexed). 

EDIT 2: Been having fun mucking about with custom colour temperature on my monitor once I found out how to do that...