Pic of the HID light installed on one side. You can compare the brightness and color difference with the stock halogens. I had also changed the stock parking light(type w5w) and fog light(type 9006/HB4) with some Phillips CrystalVision halogen bulbs, which are supposedly 4300k in colour. The parking light seems white enough, but the fog light still seems pretty yellowish, but there does seem to be a difference in colour if you compare to stock.
Pic of the completed install from the inside. You can see here the wires coming out of the dustcover, which then lead to the ballast mounted underneath the lighting assembly. I also thought it was a good idea to use some sticky-backed felt on the ballast so that where it had contact with the metal mounting bracket, there was some felt there to take the shock and to avoid metal on metal grinding. It also made the ballast sit nice and tight inside the bracket.
Pic of the beam pattern after I had installed the HIDs into both headlights. As you can see, the beam pattern matches the stock halogens(marked by the masking tape) so there probably wasn't any need to get the beam pattern adjusted. I went to the dealer anyway just to double-check it, and they confirmed that there was no need to adjust the beam pattern at all. You can also compare this pic with the picture of the beam pattern with the stock halogens and see the colour difference is quite dramatic.
Pic of the car with both headlights replaced with H7 HID bulbs, parking lights and fog lights replaced with 4300k halogens
The "favourable" side effect I alluded to earlier, which I attribute to connecting the HID bulbs direct to the stock halogen bulb fitting, and NOT using a relay, is that I never got the strobing. This was an effect that a lot of other people had experienced after they had installed their HIDs whereby, if they turned the lights on without the engine, it would be fine, but if they turned the engine on, the HIDs would flicker or strobe. Rapid voltage pulses like this will cause damage to the ballast. This flickering or strobing was attributed to, as far as I know, the onboard computer where it detects a problem with the bulbs because the resistance is too low, so it thinks the bulbs have blown. The fix for this was to get the dealer to set Xenons=Present on the gateway, so that it expects less current(as the HID bulbs only use 35w as opposed to 55w for stock halogens). I'm still not exactly sure whether this is right or not, just that I never got the strobing effect from the start, and I think it was because I didn't use the relays.
I did go and get the dealer to set Xenons=Present today anyway just to make sure I wasn't causing any inadvertent faults, and also to check the beam pattern. Told them to change it in two places, the Main diagnostic in controller, and also the Gateway, as that was what I had found from other threads on installing HIDs. They could only find the Gateway setting and changed it, but couldn't find the other setting. Not sure if this will cause any problems, but I didn't have any obvious issues before I had the setting changed, so its not like I can check whether the strobing occurs at all.
Anyway, very happy with the finished product. Now thinking if I should change the stock fog lights for HIDs(so they match the headlights), only problem would be to find a place to mount another ballast!