RE:
A tip to save your vision and aid in getting the lamps set. When doing
the high-beam setting, all four Lamps are lit, whole wall is ablaze
with light! Pull the fuses on the lights you are not adjusting, allows
you to see the beam better on the one you are adjusting at the time.

That's good advice.  I just made a cover for the lights not being adjusted,
taped it in place.