I backdated the headlights on my '86 to the earlier round ones a few
years ago.  Lately I noticed one of the Sylvania brand sealed beams
had water in it but was still working.  The reflector was totally
dull gray and it was throwing very little light.  I decided to
upgrade to the Bus Depot $35 set.  When I went to swap them out I
found that the "good" sealed beam also has droplets  of water in it
and the reflector was looking kind of dull.  The new ones went in
easy and the initial test of the van pointed into the garage was
WOW!  Big difference in brightness and light pattern as well.  On low
beams they have a distinct cut off and put a lot of light down
low.  On high it is more straight out.  Just seat of pants
impression, I haven't even had it on the road to see if I need to
adjust them.  I put a little WD40 on the adjusters when I put in the
new lights in preparation that I might need to turn them.

Edward