What I know is that any of the after market hid kit are illegal. The design of halogen headlight and hid headlight are different, so when you put hid kit into your halogen headlight would produce glare which will blind other people. If you want to see the differences, for reflector headlights you can compare the hid of IS, GS, & etc to other halogen. For projectors, you can compare them with TL, TSX, & etc. You can see the sharp clear cut off lines of the factory hid.
If you decide to put after market hid kits on, pls aim your headlights lower.
I heard the best temp is 5300k, you will have the best vision. Hight temperature doesn't mean you will have better vision. Try compare a 4300k to a 8000k or 10000k, you will notice to different.