Also.. look into regional Color temperature settings while keeping all the above replies in mind. Different locations around the world have different Color temps at different times for outdoor light. Higher the Color temp.. the more orange.. lower the more blue.
look here
http://www.schorsch.com/kbase/glossary/cct.html
terms http://www.xrite.com/support/Glossary.asp
Also.. I had a link to a sight that would convert RGB or HSV vaules to ColorTemp but I cannot find it! ARGH.. if you find something that does this let me know I'd love to find it again!
Old Quake players never die, they just go play other games for a while.