Well closest to sunlight is 4300k which is white and all stock vehicles use.
6000k are for off road use only, not legal in any state. accept for japan.

4300k= 3200 lumens- 3400 lumens
6000k= 2400 lumens

The higher the kelvin the more blue/purple which outputs less lumens.
If you check carefully in your road traffic laws, there is a minimum of lumens and maximum lumens output.
Also the colour you should be outputting.

So if you have BLUE 30k bulbs,
-the output is not white,
-lumen is lower then minimum
-Bulbs are colour coated( big no no)
= Ticket is valid

There is a reason why stock vechicles use ONLY 4300k.
Good luck