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  #145  
Old 01-07-2011, 01:45 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by JoeSchmoe007 View Post
Can you explain what the deal is HID headlights (I never had them)? Why are they so desirable? Just because of the "coolness" factor (light is different color)? Or do they actually provide more illumination?
HID lights typically (but not always) use projectors instead of reflectors. You can also have projectors used on a non-HID headlight system. Some people will tell you that projectors are superior to reflectors when it comes to illuminating the road. In most cases, that's probably true. But it totally depends upon the reflector headlight in question. Some reflector headlights are designed much better than others, so it's hard to make the blanket statement that projectors are a better option.

HID lights also give you a different light temperature. They are usually a "white" light, which almost look like it has a blue tint to it. That's probably the coolness factor you're talking about, but like everything else, the color temperature can vary.

I've had HID with and without projectors. I've also had projectors without HIDs. And of course I've had regular reflector headlamps. One thing I don't really like about projector HIDs is that they tend to have a very sharp cut-off, meaning that the light extends out and then cuts off sharply. This is something you just don't see on reflector headlight systems.

Probably the best headlights I've ever had were on my E36 BMW M3. They were a simple reflector headlight, but they were excellent. Great light dispersion, great distance, and just overall great illumination.
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  #146  
Old 01-07-2011, 03:44 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by JoeSchmoe007 View Post
Can you explain what the deal is HID headlights (I never had them)? Why are they so desirable? Just because of the "coolness" factor (light is different color)? Or do they actually provide more illumination?

Generally, the lighting is much better with HIDs than halogens. Once I owned a car with HIDs, I will never go back to halogens.

I could care less about the "cool factor".

Do a test drive at night and compare them!
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  #147  
Old 01-07-2011, 05:06 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by JoeSchmoe007 View Post
Can you explain what the deal is HID headlights (I never had them)? Why are they so desirable? Just because of the "coolness" factor (light is different color)? Or do they actually provide more illumination?
MSCA pretty much summed it up nicely, but if you have never owned a car with a nice pair of quality HID projectors you will be in for a big treat with a new limited or Overland. Projectors can put more light where its needed. They provide a very wide and even light output that is very bright compared to a standard halogen headlamp. They also have very sharp cutoffs which are nice for uncoming drivers so they arent blinded.

The Limited and Overland headlights are also bi-xenon which is amazing. The cutoff shield in the projector moves so that all possible light comes out of the projector (its your high beam) and you can just see forever.

once you go HID you will NEVER want to drive another car with halogens at night.

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  #148  
Old 01-07-2011, 06:12 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by JTS97Z28 View Post
once you go HID you will NEVER want to drive another car with halogens at night.
james
Absolutely!!!!
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  #149  
Old 01-07-2011, 07:28 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by JoeSchmoe007 View Post
Can you explain what the deal is HID headlights (I never had them)? Why are they so desirable? Just because of the "coolness" factor (light is different color)? Or do they actually provide more illumination?
A number of people have commented that the WK2 HID's are the best HID's they've ever used.

I would have to agree.
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  #150  
Old 01-07-2011, 07:35 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by JoeSchmoe007 View Post
Can you explain what the deal is HID headlights (I never had them)? Why are they so desirable? Just because of the "coolness" factor (light is different color)? Or do they actually provide more illumination?
Hate to rain on the parade, but here's my take on the HIDs. They are cool, and I'm glad my WK2 has them, but...

My previous vehicle had sealed-beam halogens (not 'modern' specialty halogens with plastic lenses), and it had better high beam illumination than the WK2 HIDs. The HIDs have a 'hotter' light temperature (i.e. bluer, or whiter if you will), but the old sealed beam halogens actually threw a further and taller beam of light.

The other thing I've noticed is that when the HIDs are on low-beam, they have a very severe horizontal cut-off, certainly intended to prevent the beam from glaring into the eyes of oncoming traffic. But the cutoff is so located that it can easily cut off illumination of high signage that I want to see when on low beams - sometimes I can see the post supporting a sign, but the sign itself is in darkness due to this severe cut-off.

And since I am often driving on country roads with rolling hills and curves, the HIDs do not provide as good illumination off to the sides and 'up the hills' of the roadway as the wider/taller beam of my old sealed beam halogens. The HIDs take getting used to.

I'm not saying the HIDs are poor. I like them and would not go back. But neither would I make a vehicle purchase dependent on them.
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  #151  
Old 01-07-2011, 09:50 PM
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Re: 2011 Grand Cherokee - reliability

Doesn't the WK2 have halogen high beams? Most HID equiped cars do.
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  #152  
Old 01-07-2011, 10:05 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by Jeff_Jeske View Post
Doesn't the WK2 have halogen high beams? Most HID equiped cars do.
No, both low and high ar Bi-Xenon HID's, on the WK2's that have HID's, of course.
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  #153  
Old 01-07-2011, 10:10 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by Cherodude View Post
Hate to rain on the parade, but here's my take on the HIDs. They are cool, and I'm glad my WK2 has them, but...

My previous vehicle had sealed-beam halogens (not 'modern' specialty halogens with plastic lenses), and it had better high beam illumination than the WK2 HIDs. The HIDs have a 'hotter' light temperature (i.e. bluer, or whiter if you will), but the old sealed beam halogens actually threw a further and taller beam of light.

The other thing I've noticed is that when the HIDs are on low-beam, they have a very severe horizontal cut-off, certainly intended to prevent the beam from glaring into the eyes of oncoming traffic. But the cutoff is so located that it can easily cut off illumination of high signage that I want to see when on low beams - sometimes I can see the post supporting a sign, but the sign itself is in darkness due to this severe cut-off.

And since I am often driving on country roads with rolling hills and curves, the HIDs do not provide as good illumination off to the sides and 'up the hills' of the roadway as the wider/taller beam of my old sealed beam halogens. The HIDs take getting used to.

I'm not saying the HIDs are poor. I like them and would not go back. But neither would I make a vehicle purchase dependent on them.
Sounds like your adaptive leveling is adjusted too low.

In any case, the days of poorly focused sealed beam halogens are numbered.
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  #154  
Old 01-07-2011, 10:13 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by Jeff_Jeske View Post
Doesn't the WK2 have halogen high beams? Most HID equiped cars do.
On the WK2 with HIDs, the same bulb provides hi and lo beams. The switch just causes its focus to change. A separate bulb is used for the Daytime Running Lights.
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  #155  
Old 01-07-2011, 10:44 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by GlowingGhoul View Post
Sounds like your adaptive leveling is adjusted too low.

In any case, the days of poorly focused sealed beam halogens are numbered.
Just posting my experience.

My HIDs are aimed in the same manner as shown in Nbtstatic's pics. See Photos 6 and 7 at Post #12 in the thread linked below, which seems to be the HIDs (likely since inside the garage). You can see the sharp horizontal cutoff of the top of the beam. Anything above this HID line (on low beam) at night is in darkness. The old 'poorly focused' sealed beams had no such problem.

http://jeepgarage.org/showthread.php?t=14526
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  #156  
Old 01-07-2011, 11:15 PM
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Re: 2011 Grand Cherokee - reliability

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Originally Posted by Jeff_Jeske View Post
Doesn't the WK2 have halogen high beams? Most HID equiped cars do.
Laredo's have halogen high beams limited and overlands get hid high and low and inboard lamps are daytime running lamps.
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