Would I be correct in thinking that 8000K is pretty much white-white, with 6000K being bluey-white and 5000K being rather blue?
8k is fairly blue to look at...but whitish blue. any lower and IMO its too blue. 12k is almost perfect white
Alan
Here is what the manufacturer says it looks like the 6000 is the best to go for
The K (Kelvin) Temperature range is a basic unit of thermodynamic temperature (colour temperature) used to measure the whiteness of the light output. The higher the number is, the whiter the light is. When over 5000K the light begins to turn to blue as daylight.
There are only really 4 colours of HID available, despite the claim of sellers and manufacturers to the contrary. These are Standard factory 4300K (yellowish white), 5000K crystal white with no blue tint, 6000 crisp white light with delicate to moderate blue tint, and 8000K strong blue light. The highest light output is 4300K and the lowest 8000K.
I have been driving with HID Xenons now for many years and as you may have guessed I have tested every combination of Kit, bulb and colour. The following is a summary of my findings (objective as I bought light meters to measure the actual light outputs) and recommendations (both objective and subjective), which most customers agree with:
OEM is 4300K and without a question gives the most amount of light. I have tested dozens of bulbs and compared them all to a Philips D2S bulb as a reference point. The difference between colours and manufacturers is really quite shocking. The best 6000K bulb produced 15% less light than the Philips 4300K - while the worst 6000K bulb was a dreadful 70% less. That said, our bulbs being the best ones with 15% less light in measurable terms, actually produce a very white light with a slight blue tint when you look at them. For every day driving this really is a more pleasant light than the yellower 4300K. as its whiter light is more pleasant and in most driving conditions appears brighter. The reflection from signs and white lines is far better with the 6000K.
If your after the coolest looking Xenons with amazing performance then 6000K is my recommendation.
If you are after the most amount of light on the road then I recommend the 5000K - which is a little whiter than the 4300K whilst having NO blue and very similar light output to the 4300K with our ballasts. For the purists we do have some 4300K bulbs also.
If you are wanting the look of the OEM factory fit Xenons then please remember that the blue is not produced by the bulb, but by the reflector/projector lense. Refraction spilts the colour of the light like a Prism if you remember that experiment from Physics. When you get up close the bulb is actually 4300K with a yellow tinge. 8000K bulbs or higher are not the answer - they produce very little light – up to 70% less than the 4300K and the Police do not like them. Also the blue light is tiring on your eyes and will turn rear number plates Green!
One last thing as proved in our testing, not all manufacturers colour ratings are the same, so please dont try to compare! Some claim 12000K is sky blue!! Wrong - should be purple!!
Hope this clears it up no punn intended lol