Madbat's right. Until you're sure exactly what temperature the light should be, keep it at the default (6500), and just adjust the emission color. One thing I've also noticed in my own renders is that the strength of the light can affect it's color to a certain degree. If I have a blue-violet light @ 6500, if I make it too strong, it appears more purple than blue. You might want to try sliding your orange color a little more towards red to see if that helps.