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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