I am currently in the market for a radar detector, and in my internet searches I came across a paint-on product called Veil G4 that appears to really help with reducing a vehicle's exposure to laser speed traps. No! - I am not in any way associated with this product, but their promotional videos do seem to indicate that it does drastically reduce the ability of police laser to obtain a lock on the vehicle's speed.
It is simply painted on headlights, fog lights, and anything else that can reflect the laser beam (i.e CHROME) and it appears to add a "smoked" appearance when applied. I was going to try it in conjunction with a good radar detector (Passport 9500ix), but after looking at the front of my V, I realized that I would have to coat not only the headlights / foglights, but also the grill, chrome trim aournd that, etc. As I do not prefer to "black out" these items on my car, I decided that the Veil was not for me.
However, if you are looking to blackout the chrome on yours, this might be an interesting solution as it simply paints on, can be removed, and if you want it darker, you can simply apply more coats. Of course, the side benefit would be a (purported) significant reduction in exposure to laser spped traps.
Veil's site is here: http://www.laserveil.com/
and do keep in mind that I have not tried this to be able to either confirm nor deny that it works as intended. If you watch their videos though, they do appear to be pretty compelling.