i guys, i want to change the headlights on my 156. it's a 1.6 ts from 2001. i have the stock now but i would like some white lights as xenon. i have read other posts but couldn't figure out too much. so my questions are: can the headlights can be changed with xenon/LED? only one beam can be changed? (short or long) or both? what should i be aware of? i must say i don't know so many technical details so please be patient and if some of you did it an approximate cost? thank you what about bi-xenon? a dealer guarantees(refund) that will fit even if it`s not D2S it`s H1. is he just trying to sell? i can give you a link from the website.( 10000K (bl) - H4 bi-xenon kit 10000K ) maybe an opinion about bi xenon? Problem with HID lights is they don't come to full brightness immediately, so they can't be used for flashing headlights. In UK, main beam lights must be flashable. I'm sure you could get them fitted as aftermarket halogen replacement kits, I'd just worry about the wait from dipped to main beam. The OEM HIDs on my car take about 3-4 seconds to get up to full brightness. If you needed immediate brightness, at speed, that's a long time. Problem with HID lights is they don't come to full brightness immediately, so they can't be used for flashing headlights. In UK, main beam lights must be flashable. It isn't