These vents will not drain the water out of the lights as such, but any slight moisture that ends up in the lights will be allowed to escape when the heat from the lights assists its evaporation. I wonder why they added these adaptors to the ends of the pipes, are they known to improve things?
I've also got the front of my car, and the lock carrier out into the service position to finally get round to replacing both drive belts, only a year after buying them, now waiting for a low profile M10 Spline socket so that I get the supercharger idler pulley bolt torque just right!