What headlight bulb do I need?

[jamoca]

Probably a question that's been answered here many times before, but my search capabilities are failing me tonight...

One of my headlight bulbs is turning the dreaded pink so looks like I need to replace them. How do I tell what lights I have, and therefore what bulbs I need?

I know they're Xenon bulbs but how can I tell if they're Xenon / Bi-Xenon and Standard / Dynamic? Is it the D2S that I need?

Don't have a close up (as it was dark when I noticed tonight) but here's a relatively recent one.

Thanks in advance!