Quote Originally Posted by NegativeOne13 View Post
4300k is pure white and what manufactures put in stock.
5000k is what they put in Nissan and acura. it says in the little paper that comes in the box with the bulb. also you can tell because there is always blue in the bulbs even when they are warmed up. 4300k goes white when warm and is only blue for a few seconds on start up.