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Constantly flashed while low beams are on

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by IAPrius, Aug 30, 2016.

  1. IAPrius

    IAPrius Active Member

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    ....no not the good kind of flash.

    I have a Gen 4 w/ ATP. My car is constantly flashed by oncoming cars who basically think I have high beams on even when I have low beams on.

    Are these beams that bad? I've never actually seen one oncoming. Also is there anything I can do to fix it?
     
  2. bisco

    bisco cookie crumbler

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    might be aimed a little high. why not have the dealer check it while you're still under warranty?
     
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  3. DadofHedgehog

    DadofHedgehog Active Member

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    You can easily adjust them yourself with a ratchet+ a 10 millimeter short socket. On the rear center of the headlight units, there is a 10 mm male six-sided nub. Drive the car at night to about 20 feet from a brick wall in your neighborhood (brick wall's horizontal mortar lines make a very nice measuring device), measure at the front of the car from the ground to the top of the bean's light when it is on low beam, then measure a similar amount on the wall, minus (down) about three inches... that is your aimpoint. Crank the 10 mm ratchet one way or the other until the top cutoff line of the beam on the brick wall hits your selected mortar line of "horizontal minus three inches"... do the same to the other light, and you're done. ...for free ;-)

    Posted via the PriusChat mobile app.
     
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  4. Gen 2 Tom

    Gen 2 Tom Active Member

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    They are real brite and real white. A lot more light on the road than my Gen 2. I really like them on the country roads I'm on. The alignment of mine looks good.
     
  5. alanclarkeau

    alanclarkeau Senior Member

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    You don't inadvertently have the FOG LAMPS on? They're annoying on many cars.
     
  6. robsnyder20

    robsnyder20 Active Member

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    Mine also are constantly being flashed (some days more than others). I think they are very bright to oncoming cars as I used to flash my lights at other cars that seemed too bright (and they had their low beams on). Never adjusted mine as I am happy they light up the road so well. I figured they would slightly get dimmer over time with the headlamps getting glazed over.
     
  7. IAPrius

    IAPrius Active Member

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    Nope I don't have the Touring so I do not have fog lights.
     
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  8. priusgto

    priusgto Active Member

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    It actually takes a phillips screwdriver and is very simple. Look at page 635 of the owners manual. I had the same problem with people flashing me at night so I made my own adjustments in the driveway about 20 feet from the garage door, Brought them both in and down ever so slightly and rarely have anyone flashing me any more.
     
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  9. E46Prius

    E46Prius Active Member

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    I get flashed in my 2016 Lexus IS which also has LEDs. I then switch on the LED high beams and let them see what my high beams actually look like. Needless to say, they don't flash after that. Haha!
     
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  10. Coast Cruiser

    Coast Cruiser Senior Member

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    I know our Prius LED's are bright, because of all the newer Corollas I keep seeing at night. Their LED headlights are very bright.

    I hate it when a big truck, or car with LED's is behind me. I asked my "tint man" if he could re-do my back window to a darker shade.
     
  11. Tideland Prius

    Tideland Prius Moderator of the North
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    The Corolla ones must be aimed right at the legal limit or something. Any bump will flick them up to your eyes. Also, the lens that they use give off a blue tinge when viewed from the front (but they're pure white from the driver's seat). They're used as DRLs here so I see them on all the time.
     
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  12. grape808

    grape808 Active Member

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    This is my first week driving my new Prius. I think the first morning I drove it, I probably only had the runners on. The next day I switched to auto lights, and I thought I had accidentally switched my highbeams on, just based on how bright they looked on the ground compared to my old car. I had to actually flash my highbeams to see the difference.

    Also at a light behind a truck with chrome bumpers, the reflection of my own headlights were pretty annoying. I don't know what they look like to oncoming cars.
     
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  13. Coast Cruiser

    Coast Cruiser Senior Member

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    They are pretty bright. A world of difference from my old Camry.

    But the weird thing is, I don't notice a big change in intensity when switching from DRL- to Low Beam - to High Beam.
     
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  14. Tideland Prius

    Tideland Prius Moderator of the North
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    Yes, the change between DRL and low beam is quite small.

    Between low and high, there isn't a change in intensity. Only a shade moves.


    Left side is low beam, right side is high beam.
    upload_2016-9-3_8-46-43.png
     
  15. Coast Cruiser

    Coast Cruiser Senior Member

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    Thanks for the illustration, Tideland.

    I'll tell ya what I hate, it's those ridiculously bright blinding aftermarket LED headlights, and/or fog lights that these guys put on pick-up trucks, or their "sporty" sedans. Probably illegal. Blinding as all heck.
     
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  16. Tideland Prius

    Tideland Prius Moderator of the North
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    Probably, as well as poorly aimed lights.

    Part of it is light colour. I'm sure someone who has more knowledge on optometry can chime in but a whiter light is more sensitive to the eyes than a yellow light and is perceived to be brighter or more glaring (probably because of the blue light spectrum in white light). So even properly aimed ones from the factory look bright as heck. The good thing about LED is that they're directional and therefore they only point where they're aimed (unlike say a regular bulb that shines in all directions).

    The other part is those that add aftermarket lighting but don't do a full retrofit (that is, replace their headlight housing with a set of lens that's actually designed for HIDs, which is the common aftermarket light upgrade) or they add HIDs to multi-reflector lens (I find projector lens tend to control light better). Multi-reflector housings that were meant for halogens will have the polygons designed to throw light in a wide angle to illuminate sign boards as well as the road. Multi-reflector housings designed to HIDs with obviously have some design feature to limit the light from blinding oncoming traffic (more commonly known as a cutoff light). For example, the Gen 2 had multi-reflector headlights whether you had the halogen or the HIDs but the HID ones have a cut off that you can see if you were to look at the housing (not directly at the light, obviously). The halogen tends to fill the housing so it looks like the Prius has a nearly square light while HID-equipped Gen 2s had a more "horizontal" or letterbox light design.

    Here's a multireflector lens (this is a dual-filament halogen)
    [​IMG]

    Here's a projector style lens (projector halogen low beam. multi-reflector halogen high beam. The blue frame is the LED DRL/parking light)

    [​IMG]
     
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  17. HVAC

    HVAC Member

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    I have read about the concerns here and have had people flash at me too. It seemed that the beam was straight out and did not rise or fall when approaching a object. The light pointed too high with the slightest bump or grade change. I just lowered them per the owners manual directions. I can actually see the road better closer to the car and think I will not be blinding people now. The high beam still lit far ahead just great.
     
  18. RCO

    RCO Senior Member

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    Last evening I driving home after sundown. It was twilight but the headlamps were on and it was just possible to see where the dipped beam was cut off on the road ahead of me and the kick up to the nearside. The road was contraflow at rush hour, but there were no flashes from opposing traffic, so I reckon my heads are focused ski as not to dazzle. Therefore, I suspect that some dealers are not checking the beam alignment is OK before delivery to customers. Personally hating being dazzled at night by others, my recommendation is to complain to dealer and get them fixed asap.