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LED headlamps

Discussion in 'Technical' started by malcolm, Jun 1, 2008.

  1. malcolm

    malcolm Active Member

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  2. vfx

    vfx Well-Known Member

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    Maybe they will put them in as a 2009 upgade in the Roadster.
    Nice if they or some aftermarket Co. came up with a LED headlamp conversion kit.
     
  3. WarpedOne

    WarpedOne Supreme Premier

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    Does anyone know LED's power rating?
     
  4. SByer

    SByer '08 #383

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    Which LEDs? Seriously, you can get up to 5W LEDs now. Lumens/W is at about 50-70 now. What's attractive for autos is more the smaller, more flexible form factor than for other lighting technologies. That, and the incredible, reliable lifetime.
     
  5. WarpedOne

    WarpedOne Supreme Premier

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    >> That, and the incredible, reliable lifetime.

    I read this is only true as long as you manage to keep those LEDs cool - around 25 degrees celsius. If they "overheat" above 35 degrees their life span dramaticaly shortens from couple of years to couple of hours.
     
  6. malcolm

    malcolm Active Member

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    Not so smart for daytime running lights, then.
     
  7. SByer

    SByer '08 #383

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    Daytime running lights not so smart themselves ;-).
     
  8. WarpedOne

    WarpedOne Supreme Premier

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    >> Daytime running lights not so smart themselves ;-).

    Daytime lightning conditions can vary a lot. Trouble is, if lights were not mandatory, a lot of people would not turn them on even when conditions are very very poor (storms, fog, ..).

    Automatic sensor controlled lights would be ideal solution
     
  9. Albern

    Albern Member

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    #9 Albern, Jun 11, 2008
    Last edited: Jun 11, 2008
    Hey Guys,

    I was intent on doing some further research and report my findings on LEDs. Without going into that for now here are my thoughts on what has been brought up thus far along with some other considerations:

    - LEDs make perfect sense, especially in an EV application since it requires less energy to emit the same amount of lumens; I've even heard that LEDs can be even brighter than xenon lights
    - Although LEDs are still expensive they are much cheaper than xenon lights; I'm surprised that the Roadster doesn't have them as standard since pretty much all luxury/sport vehicles have them. Correct me if I'm wrong but I heard that they also use less energy than halogens.
    - Personally I like daytime running lights (DRLs) as a safety feature although I've come across some complaints ranging from glare to fuel consumption. Compared to not having DRLs, those that do have them are much more visible when looking up the road. My one concern with DRLs though is that I've begun to notice that automakers are really starting to aim them so high that they cause significant glare to other motorist's rear and side view mirrors.
    - I don't know if anyone has noticed but automakers seem to be switching to red rear turn indicators as oppose to orange ones. I am aware that in North America rear lights can only be white, red, and orange. To me red should be reserved for the fog/parking and break lamps, while orange is strictly for turn indicators (and white obviously for reverse). People are going to get confused when they see a flashing red light that refers to a lane change while the driver ahead intends to slow down. This becomes more apparent when I always see people who are not aware that some of their exterior lights need to be replaced and we have a situation where if they break it can initially look like they are initiating a lane change.
    - Automatic headlights are a neat feature but as far as I'm concerned, if you are the type of driver who needs to be reminded of when you should turn on your lights and thus rely on that feature we have a serious problem here.
     
  10. doug

    doug Administrator / Head Moderator

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    Ferrari Italia

    [​IMG]
     
  11. Norbert

    Norbert TSLA will win

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    Now at 111 Lumens/Watt (and, as far as i can tell, it should be usable for headlights):

    CREE |Cree Raises the Bar for Lighting-Class LEDs with Commercial Availability of the XLamp XP-G LED

     
  12. Norbert

    Norbert TSLA will win

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    #12 Norbert, Nov 3, 2009
    Last edited: Nov 3, 2009
    And , if one uses them at 200mA instead of at 1000mA (requiring, of course, 5 times as many), they seem to deliver about 150 Lumens/Watt.

    (Which, according to some unverified 2006 info, is the then maximum for xenon lamps.)

    See this (though I think non-professional) test at the bottom of:
    CandlePowerForums - View Single Post - White LED lumen testing
     
  13. DrComputer

    DrComputer Member

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    I don't quite know what is taking Tesla (and other manufacturers) so long to adopt LED headlights? My Lexus LS600hl has them and my car is now over two years old.
     
  14. TEG

    TEG TMC Moderator

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    #14 TEG, Nov 4, 2009
    Last edited: Nov 4, 2009
    2008 Audi A4:
    [​IMG]

    I see them on Audis all the time now.
     
  15. TEG

    TEG TMC Moderator

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    Audi A5:
    2639425689_250d49b5b5_b.jpg
     
  16. DrComputer

    DrComputer Member

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    In those examples, Audi is NOT using LED's for actually headlights, just pretty accent light. Lexus is using them for actual low-beam headlights in the LS600hL.
     
  17. TEG

    TEG TMC Moderator

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  18. TEG

    TEG TMC Moderator

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    From 2006:
    LEDs Magazine - LED headlights available on Audi R8 from late 2007
     
  19. DrComputer

    DrComputer Member

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    Yes, the R8 does offer LED headlights as an option (and no, they were not the first, Lexus was). But the pictures above were not LED headlights.
     
  20. stopcrazypp

    stopcrazypp Well-Known Member

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