Thanks for the link Keith. I noticed Article 43: Faros delanteros de luz blanca o amarilla en no más de dos (2) pares con alta y baja, ésta última de proyección asimétrica:
(Freetranslation.com: "Headlights of white light or yellow in no more than two (2) pairs with high and
low, the latter of asymmetric projection.")
Which seems to definitely imply that the crazy lights you see on the front of some cars are illegal. Of course the police don't seem to mind though.