I've got the 8000K set from McCulloch. The output isn't as good and has a ricey blue color too it. I got some 6000K bulbs which I know have very good lighting cause my friend has em in his Maxima, waiting to be installed when I get my baby back from the paint shop. The higher the temp., the less light output you have. 6000K having a white with slight purple tint, 8000K having a blue tint, 10K is a bluish purple and 12K being straight up purple. Temp.'s like 5000K and down have more of a whiter look. Hope this clears things up a little bit.