+13000k = still bright, but very yellow
4300k = brightest, OE HID color, white with a slight hint of yellow
5000k = still bright, white with a hint of blue
6000k = noticeably less bright, fairly blue
8000k+ = don't even think about it - way too dim and way too blue/purple
I've had 4300k, 8000k and 10000k, and i would update the list with the following personally:
4300k = Yellow!
8000k = Perfect white similar light output to 4300k
10000k = White with a slight hint of blue. Less light output than 8000k, but not terrible.