Head light moisture

Try (www.certifit.com) for replacement head lamps , as for drying them out , when you control the humidity in the air instead of Mother Nature go ahead

New head lights. Drill a hole in the bottom to drain water if you can't afford new ones.

As the above poster suggests...plus can even reseal the seam area with a clear RTV. If the seam is symmetrical, one can use a red, black or blue rtv sealer, wipe the seam with finger, (as in tile laying), and have a nice effect when mounted back in recess. On a Lincoln note, there are aftermarket head lamp assemblies with the addition of a lower strip LED...tres Kewl look.