Yes the blue ones are worst of all, don't know if they are halogen or xenon but they are a very penetrating light. When someone is coming up behind you on a motorway you'd swear they were on full beam until they get close behind you then they seem to change colour. I had a deflector switch on the rear view mirror on my last car which was very useful, kind of a prism inside the glass that stopped you getting dazzled. Unfortunatel they didn't fit one on the current model. Think I'll get some night vision tinted glasses if I can get them with prescription lenses.