Both headlights on my 04 PSD quit working within the past couple of weeks. I had replaced the original bulbs with 100W J. C. Whitney units. They worked OK for 2 1/2 years and more than 20,000 miles before failing simultaneously. As it turned out, both sockets had been burned up by the extra heat, and it was not covered by warrantee.
I replaced my headlight bulbs with ones that had 100W high-beam filaments (normal low beams), and these blew the Ford's high-beam fuse after about a year of use. (High-beams stop working, low-beams still OK.)
I'm back to my old headlight bulbs. Maybe I'll try to add some small driving lights flush-mounted behind the grille instead.