4300 vs 5000k is a small difference. Most OEMs use 4300k on their HID's. Regardless 5k HID's will be much brighter than halogen. I have the 5k Amazon Kensun's bi-xenon's on my Ford. Huge improvement.
With the Cree LED's on my Leaf, they don't hit the road as well, however have an amazing reflecting effect on street signs, better than driving with my stock high beams.
2016 SV; purchased 20-Jan-17, <5k, 98% SOH; 01-Apr-17
2013 SV; purchased 6-March-13 44k, 81% SOH; 3-Apr-17
2015 S; purchased 29-July-14, moved to AZ Nov-2014, 19k, 83% SOH; 30-Mar-17
(LD storage) 2009 Ford Escape Hybrid 4x2), 101k