finally had a few spare time to take some updated pictures of the 4300k vs 6000k (sorry for the bad quality from my cell phone)
here is the 4300k on both side:
this is 4300k on one side: (please pay attention to the green plants in front of the windows, it is truly green color and cut-off is very sharp)
this is 6000k on same side: (look at the same plants, it doesn't look green because the 6000k lack of natural sunlight color, overall area looks dimmer, also cut-off is not as sharp as 4300k)
this is 4300k on driver side, 6000k on pass side:
this is both side 4300k, the light output on the ground. hardly find a dark place near my house:
this is about 130-150 feet away from the wall, there's too many street light on the side, can't really see clear how's the output on the ground:
thing was really sucks, found out one bulb was actually a little bit off focus, email the seller and hopefully there's an exchange item or something.
a few pictures above show the tail of the cut-off from the 6000k was pointing up, and the 4300k was flat and pointing down a little bit at the end. that was because the 6000k were re-based from a pair of 9006 based bulbs. the filament was slightly off by the standard measurement, that's why it caused that, and also very little blue at the cut-off from the 4300k but more blue at the cuf-off from the 6000k is due to that reason too. people probably would know i am using a fake kit due to the slightly blue from 6000k, but now using 4300k, it really looks OEM spec.
hopefully my friend can bring his professional SLR and take some serious nice pictures soon.
personally, i like the 4300k way better than 6000k. 6000k can't provide a brighter visibility at night, not as white as 4300k. when i had the 6000k driving at night, my eyes seem more tired because the blue tint color required more strength from my eyes to check the condition on the road. but using 4300k, my eyes feel a lot more comfortable even at a very dark country road.
i don't really care about the cool blue looking from 6000k, visibility is the first priority for me, so 4300k is better in my opinion.