Search Mate. Plenty of threads about this topic. Why sign up and immediately post a one line thread without even searching. Okay, now I have said my piece, I will give you some advice.
I have been researching HID's for quite some time. There are many misconceptions and many different thoughts about whats best and whats not.
The best site and customer service to go to for HID is;
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These may cost a little more than ebay items, but if you have any issues, you know the customer service is there to help. If any issues arise with faulty parts, all this gentleman at ezihid needs is a pic of the item with the cords cut eg faulty ballasts, and then a replacement will be sent. I have been dealing with Len and Ezihid and have just ordered my HID Kit for low beam on my VZ Calais which has projector H11 lights like yours. I ordered H11 6000k 35w standard size ballasts.
Many people will say go with 50w kit. But these are far too bright for town driving and there is no need. Other people will say go for lower or higher than 6000k. This number is the colour temp rating. 4300k is a white to yellowish light. 6000k is a white to blueish light, and anything above 6000k such as 8000k and 10000k is dumb. The light given off at these higher colour temps are near purple and produce less usable light.
The reason I went for 6000k is that if you go for 4300k which is the other popular choice, the reflections seem to be too intense on road signs. 6000k is still bright but the reflections are slightly less intense and the light output between the two colour temps is only about 7% lower on the 6000k. But bear in mind, a set of 6000k 35w HIDs are 3 times brighter than a normal 55w halogen globe. The 50w kit is 5 times brighter but unless you only use on a farm, they can be dangerous for oncoming motorists due to the brightness and especially if you load the car up and the lights point up a little.
So the final say for me is buy from Len at Ezihid and buy a 35w 6000k H11 kit for low beam, and if you want high beam, then go for 50w 6000k H9 kit.
Regards
Matt
PS: Search mate before jumping in and asking questions which have been answered many many times before. Many people consistently do this and it becomes boring.