well provided the lens isnt yellow, its the glass projector dome fella.
you could use some slightly illigal 100w bulbs or summat instead of HID`s,

My 1999 A4 lights are truely shocking, 100w bulbs made it better (but not 100%)
i tried untold ammounts of stuipid aftermarket, xennon, night breaker, day glow neon dildo glow in the dark stylee bulbs, made fuck all difference.