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Thread: H4 bulb help

  1. #1
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    H4 bulb help

    Hello...
    Can I use any 55/65 yellow H4 bulb in my R100/7.
    I tried to buy a Piaa ion crystal but the dealers site stated that it is not compatible.
    It seems like a no brainer to me but...... you never know...
    Thanks,
    John
    Livermore, ca.

  2. #2
    Registered User lkchris's Avatar
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    H4 is a size standard as well as a performance standard. If one fits, they all fit.

    Whether yellow is legal where you live is another question.

    "Ion crystal" ... wow!
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  3. #3
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    Wow yourself... thanks for the info.

    John

  4. #4
    Monza Blue 1974 R90/6
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    My understanding, similar to Kent's above description, is that the "H4" is a specification for the size and shape of the bulb holder (metal frame) and also for the connector plug.

    So, any bulb labeled "H4" will physically fit (and work) in the /7 headlight.

    The 55/65 refers to the watts of power consumed by the bulb on low/high beam. 55/65 is standard.

    The type of bulb (blue, white, ion crystal, etc) is open to as much discussion as which is the best tire or oil. Everyone has an opinion.

    I don't think it has been conclusively proven that the most expensive bulbs with the special names produce any better lighting than a plain jane H4 costing under $10.

    Barron

  5. #5
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    Quote Originally Posted by Barron_Williams View Post
    ......I don't think it has been conclusively proven that the most expensive bulbs with the special names produce any better lighting than a plain jane H4 costing under $10.

    Barron
    Not sure about "better" lighting (as you say, most discussion in the matter are purely subjective) but the cheap H4s I have used in my cars and bikes seem to have a short life cycle even if handled with "kid gloves". Earlier this year I ponied up for some PIAA anti-vibration bulbs (Xtreme White Plus H4) for use in my airheads. They are holding up very well.
    Mark

    Current - 1974 TR5T : 1993 R100R : 1994 R100RT ~ Past - 11# 1970s BSA/Triumph Singles & Twins : 2# 1970s CZ 125s : 1# 1985 BMW R65 : 1# 1976 Moby X7

  6. #6
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    If you dig into the web there is a chart detailing the life/service you can expect from the various bulbs out there. Extremely bright comes with a trade off in hours of life. Vibration is even more important on a night ride.

  7. #7
    Benchwrenching PGlaves's Avatar
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    Quote Originally Posted by Barron_Williams View Post
    My understanding, similar to Kent's above description, is that the "H4" is a specification for the size and shape of the bulb holder (metal frame) and also for the connector plug.
    As well as the precise location of the high and low beam filaments in the capsule, so that the beams of light thrown by the reflectors on high beam and low beam also meet specifications.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://www.bigbend.net/users/glaves

  8. #8
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    Quote Originally Posted by Barron_Williams View Post
    The 55/65 refers to the watts of power consumed by the bulb on low/high beam. 55/65 is standard.


    Barron
    Actually, standard is/has been 55/60, not 65. Normal higher wattages used throughout the years have been both 55/80 and 55/100. Without a wiring upgrade, 55/100 actually gives less light output than either the 55/60 or the 55/80.
    Ride Safe, Ride Lots

  9. #9
    Benchwrenching PGlaves's Avatar
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    Quote Originally Posted by bikerfish1100 View Post
    Actually, standard is/has been 55/60, not 65. Normal higher wattages used throughout the years have been both 55/80 and 55/100. Without a wiring upgrade, 55/100 actually gives less light output than either the 55/60 or the 55/80.
    During both the '99 and '03 Iron Butt Rallies I ran an 85/130 H4 bulb in my K75. It had a relay setup - four of them - high beam, low beam, driving lights, Motolights. It also had a ceramic H4 connector at the bulb, and heavy wire to and from the relays. I certainly would have fried the OEM switch and wiring otherwise.

    Given the shorter life of the high watt bulbs, I installed them for the rally where I would be doing a lot of night riding, but removed them for everyday use where I almost never ride at night.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
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