oem phillips 4100k they look yellowish white but flicker blue and purple over hills etc. for oncoming traffic due to the projector modifications (get a thick color band) now i'm using 300zx clear halogen lenses on the headlights and the beam is super sharp and has even more of a flicker effect. like this:

mine has a wider colorband with more purple, i will try to get some beam shots up if anyone is interested.