According to the experts, 6500K is the correct color temperature. 6500K is also referred to as a "daylight illuminant", because it corresponds roughly to a mid-day sun in Western Europe / Northern Europe.
(Approximate color temperatures of various light sources:
http://en.wikipedia.org/wiki/Color_temperature#Categorizing_different_lighting)
Some say that most monitors and TVs use a default color temperature of 9300K because most people prefer the slightly bluer color temperature. This default setting causes more and more people to get used to a 9300K temperature.
As a result, the correct temperature of 6500K looks too yellow to the average person.
I don't know if that explanation is true --- I just got it from foreign forums
. But In my case, I also think 6500K is too yellow.
Maybe I should also try out a Warm color temp setting and see if I'll get used to it.