Not that I advocate 6000K like it's the end all and be all. But I spent $300 on my Philips Ultinon bulbs because they are tested and have R&D to have accurate color even if I had to replace only one bulb years after. They are of the highest quality that most cheap bulb can't claim for testing. I've heard good things about GE bulbs too. My old Philips 4300K are still running perfectly fine and bright in my dad's 540i. They are nearly 8 years old and holding. His last bulbs lasted 9 years until I changed them to mine. My sister's OEM bulbs in her Audi are 10 years old and starting to need replacing.
Cheaper HID bulbs aren't known to last that long. So cost per ownership is actually less if you spend extra money unless you've found a bulb with that magical lifetime warranty.
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Originally Posted by ZHP-FTW
