I considered 4300k simply because of the fact that it puts out more light, but I prefer the slight blue tint in the 6000k and thought i'd give it a try. I only tested the lights one night but my first impression was that it appeared brighter, might be the particular brand bulb choice and not the 6000k that makes it appear brighter, but I haven't solved the issue with distance. My fog lights put out a genreous amount of light and to essentially the same distance as my headlights so I thought perhaps my headlights need raising. They might just be out of balance from a previous ower, but looking through threads on this subject i've found numerous similar complaints but little info on what was done, other than raising the level of the beam.