I think hes talking about the interior dome light, but Ive never seen a "Xenon" dome light before. It would be rather pointless IMO to put real Xenon technology into a light intended to illuminate such a small area. If youve seen it its probably just some BS advertising to make you think its that shizzle
Just like how those cheap ass Pep Boys headlight bulbs all say "HID" and "Xenon" all over em.
I
have seen colored replacement bulbs for interior. (I have so-called "hyperwhite" dome light, vanity mirror lights, door lights, map lights. I guess they might be a tad bit brighter than the OEM bulbs, but nothing major. Just adds a lil color when i open the doors. Thats all.