H4 Vs H7

Discussion in 'OT (OFF Topic) Forums' started by Crazyjester900, Jul 28, 2008.

  1. Crazyjester900

    Crazyjester900 Hardcore MB Enthusiast

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    Hi guys can someone tell me the difference between these two bulbs?

    Thank you



    Brad
     
  2. jaymanek

    jaymanek Authorised Forum Sponsor Authorised Forum Sponsor

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    IIRC H4 is the one with 3 terminals and H7 is two
     
  3. OP
    OP
    Crazyjester900

    Crazyjester900 Hardcore MB Enthusiast

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    terminals for what?

    Cheers

    Advantages/disadvantages?

    Thanks
     
  4. jaymanek

    jaymanek Authorised Forum Sponsor Authorised Forum Sponsor

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    no they are a different fitting altogether, you can only use what your car takes..
     
  5. BTB 500

    BTB 500 MB Club Veteran

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    The H4 bulb has two filaments in it - one for dipped beam and one for main beam. The H7 just has a single filament - so if you have these for dipped and main beam you need 4 bulbs.
     
  6. prc

    prc Hardcore MB Enthusiast

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    the H4 has 2 filaments and a reflector (55w dipped beam) and 60W main beam. H7 only has a 55w filament, so you'll need another lamp/bulb to do mains. Not interchangeable.
     
  7. prc

    prc Hardcore MB Enthusiast

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    beat me to it..:)
     
  8. OP
    OP
    Crazyjester900

    Crazyjester900 Hardcore MB Enthusiast

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    so my car
    a 1996 W202 can take both??

    and H4 is preferred cause it does both high a low beam?

    Otherwise if i buy H7 i need to buy 2 kits one for high 1 for low??

    Cheers
     
  9. BTB 500

    BTB 500 MB Club Veteran

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    No.

    Your car needs one type or the other. Look in the handbook, it will tell you.
     
  10. OP
    OP
    Crazyjester900

    Crazyjester900 Hardcore MB Enthusiast

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    My car can take both,
    That was the whole point of the thread
    to tell me which i should get
     
  11. Spinal

    Spinal Hardcore MB Enthusiast

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    If you have a 1996 W202 your car should use H7 fitment bulbs, the fittings are totally different.

    Unless you have non-standard wiring of course...
    Michele
     
    Last edited: Jul 29, 2008
  12. st13phil

    st13phil MB Club Veteran

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    Is that definitely true for an Aussie-spec car? I dunno...

    Anyway, assuming that the OP intends to just replace the bulbs that are currently fitted rather than carry out a modification, the easiest way to be certain is to pop the current bulbs out and take a look at them. On the base it will say either H4 or H7. Get whatever matches.
     
  13. OP
    OP
    Crazyjester900

    Crazyjester900 Hardcore MB Enthusiast

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    H7 it is..

    does just changing the bulb really do much?

    i was thinking the full kit with ballast etc..

    cheers


    Brad
     
  14. glojo

    glojo MB Club Veteran

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    Now I am confused,
    Does your car take both lamps or just the H7

     
  15. Spinal

    Spinal Hardcore MB Enthusiast

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    Uhmmm... depends on what bulb you had and what bulb you are planning to goto...

    You cannot fit a HID bulb to a filament system without fitting "the whole kit". A filament (xenon filled or otherwise) bulb operates at 12V on a W202... A HID bulb at several thousand...

    I keep forgetting you're in Oz - so my comment regarding the H7 is for a UK spec W202. The easiest way to check if to pull the back cover off your headlights, take a bulb out and count how many "feet" it has. It will have 2 (H7) or 3 (H4)

    Michele
     
  16. st13phil

    st13phil MB Club Veteran

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    Sorry Brad, I'm only just getting the gist of this...

    I take it from your "i was thinking the full kit with ballast etc" comment that you're considering an HID conversion? If so, then Michele is absolutely right: this can only be achieved with a complete kit. As a simpler suggestion for improved lighting which will be much cheaper and easier why not try these? Very effective, totally legal for road use (HID conversions sometimes aren't) and it's a simple "plug-and-play" bulb change.
     
  17. Shude

    Shude MB Club Veteran

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    There are three different headlamp types in Europe for the W202 (I suppose six if you count LHD/RHD) but there's 1993-1996 (pre-facelift), 1997-2000 (facelift) and HID. The only conventional bulbs in use are H7s and H1s.

    I believe the USA had a pre-facelift headlamp that used H4s, so if you are checking on bulb types and stumble across a website talking about H4s then it is probably refering to USA models.

    I find it unlikely that the poorly specified USA headlamps (amber running-lights, plastic lenses and mercury-vapour or some other RUBBISH lamp type) would be used in any other region or even adapted to be used in a RHD market like Aus, especially when Japan uses the same lamps as EU and especially the UK and they're practically around the corner from Aus.

    If you don't believe me about how poor the USA spec headlamps are, have a read of some of their forums! They talk about UPGRADING to halogen! Their motoring standards are trapped in the 50s.
     
  18. glojo

    glojo MB Club Veteran

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    1850's?? :devil: :D

    [​IMG]
     
  19. Shude

    Shude MB Club Veteran

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    Yes I believe they are championing the arrival of the external combustion engine! :D
     
  20. OP
    OP
    Crazyjester900

    Crazyjester900 Hardcore MB Enthusiast

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    Ok read the back page of my book, Maybe should have done this at the start :)

    My car takes H7 Globes. The reason i started to look into HID was because my headlights are crap. they don't give off good enough light and at night my vision is less than it should be.

    I have watched a few how to guides on installing them but they don't apply to my car. That's were you guys came in. i wanted to know of a picture how to guide for the 96 C200 W202...

    I tried the philips bulbs (Just plug and go but still wasn't impressed)

    So yeh are they any H7 Conversion Kits that will fit my car.
    If yes an you send me a link.
    And if yes,
    do you know of a HOW TO..


    Thank you all for your help and comments

    :)



    Brad
     

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