http://ss091.fusionbot.com/cgi-bin/ss_s ... =154998759
They have a regular interface but the site map gives you an idea of the info available.
Specifically I was reading this http://faqlight.carpassion.info/hl-filament-bulbs.htm
Information from that site saved me from buying 3000k bulbs. I didn't realize there were so few manufacturers of bulbs and the only quality bulbs made are in 4100K, 5000k and 6000k! Meaning all the rest are painted

On a side note its fucking HARD to find an HID conversion kit that isn't a POS. The market is flooded with cheap chinese kits as low as 70$ but I have a strong feeling you get what you pay for. I doubt these kits maintain the correct beam pattern so I'm very weary.