HID Trouble

[BlueBird_p]

I know I have posted this before but I really need help with this problem. I own a Techone 12000K H4 HID conversion kit from Hidynamic.com. 12000K lights should produce a violet purple light, however mine produce a white light with a tint of purple. The bulbs, when first ignited produce the super purple color, but then within 20 seconds the lights warm up and turn white. The first week I had the lights installed everything was great and the color was really purple. However, since then I have nothing but problems. Could this be happening because the battery or alternator is not powerful enough to operate the bulbs and ballasts at full capacity? The ballasts are a general setup from Techone and the bulbs themselves are a general H4 bulb that fits the Focus. You can see the setup at hidynamic.com Does anyone know where I can find a high powered replacement altenator? Or how to test the battery or the alternator to see if that is the problem? Any ideas would be a great help. Thanks