Yeah the Xenon HID kit works great in i30. I had it installed for 1 year in my i30. Then I put it out, because the cops were checking the cars about that kit's more and more.. I wasn't into getting AU$ 500, 600 tickets
Otherwise, my was I think also 4300K (or was it 4700K?) and 35w of course. The colour was great, the illumination also. I really had a hard time getting used to normal globes again. Tried using +50%, +80% globes, but none of them come close to xenon. Beside that, I had to change them every month. So now I'm running on some "normal" +30% Philips globes, that last 5-6 months. If they start "dying" in 2-3 months, I'm going back on xenon. I'm thinking about it more and more every single day.
We've been using xenon hid kit in Santa Fe also for 2 years now (also 4300-4700K) and looks, works and illuminates great. Also haven't had any complaints from the drives driving in opposite direction (nor in Santa Fe or i30).