Get whatever SolidJake tells you to get. Not that I don't trust the advice you've gotten, but I don't understand the language of lights...so I just trust Jake.
He told me what to do in a thread I might have started...I don't recall. Search him and 'retrofit' or 'morimoto' (I think).
I need to do this myself pretty soon...my eyes are getting worse at night.
Upcoming NYC dates: Jan 8 and 27. See Facebook for other shows and PM me if you can make one...love to see you there!
Mangofy your E46!