A friend of mine bought a brand new first year BMW R90S. It came out
with the H4. I had always thought the H3 in my R75/5 was good, but
that H4 was at least twice as good as the H3. When I rode with him, I
let him go first to light the way.
The H3 was at least twice as good as the DOT sealed beams in cars at the
time. Thus I bought H4s for my 200D. I upgraded the BMW to an H4,
but then the alternator could not keep the battery charged...
Jim Cathey via Mercedes wrote on 12/28/18 9:59 AM:
US DoT mandated 35W (or less) headlight bulbs. Unless for use on a motorcycle.
I put 100W/80W H4's in our long-gone 450SL. (Relays, etc.) High beams were
thus 400W total, the light output was magnificent. Bulbs procured at NAPA,
something like $8 each. That car didn't have a lamp-out module, so I didn't
have to fight that particular battle.
http://formicapeak.com/~jimc/JSLlights.html
-- Jim
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