They are annoyingly bright to other drivers (distraction) and will most likely get you pulled over.
There are a couple cars in my area who run yellow headlight bulbs and they are very distracting at night. Not too sure how far ahead of you it will put out light. I know the higher color temp bulbs, say 15k-20k are very blue/purple and the eyes can't see that very well, so the lights look dim when driving.
If you want to see, stick to somewhere around 10K color temp which is a crisp white.