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Old 01-31-2013, 07:10 AM   #1
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H4 Headlight Pattern

I finally got my lights installed with proper relays and wiring. 90/100W units with Bosch H4 headlamps from Bus Depot. I have them aimed perfectly and do not get flashed anymore and have incredible output.

Only thing that is triggering my OCD is the light pattern. The cutoffs are very tight, but they are both angled. I tried to take a picture this morning but it didn't come out well, so I approximated in a graphic:
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They should be aimed correctly -- is this angled cutoff correct? It doesn't really affect performance but I just want to know if there is a way to level them. To my untrained eye, everything fits in place with not much room for that kind of adjustment.

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Old 01-31-2013, 07:35 AM   #2
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the cutoff should look sort of like _______/ where there is a big flat area(that should be level IMO) and then at the center of the beam it angles up and to the right. I just installed the exact same lights yesterday and they were perfect from the get go, I didnt even have to adjust them at all.

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Old 01-31-2013, 07:46 AM   #3
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If you "aimed them perfectly" you already knew about the light pattern. The intersect between horizontal and where the beam angles up is used to aim E code headlamps.

The angle is what makes them E code. They have a flat cutoff to keep from blinding oncoming traffic, and angle up on the right to light up the shoulder of the road. In Europe, they angle up to the left.
Jeep Articles / General (E-Code headlight aiming) - MoabJeeper Magazine
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Old 01-31-2013, 07:50 AM   #4
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E-code housings tend to give a relatively flat cut off along most of the beam except on the extreme right where the lens casts light upward. This allows better visibility of roadside hazards, better sign illumination, etc.
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Old 01-31-2013, 07:53 AM   #5
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Quote:
Originally Posted by lynn View Post
E-code housings tend to give a relatively flat cut off along most of the beam except on the extreme right where the lens casts light upward. This allows better visibility of roadside hazards, better sign illumination, etc.

Isn't that what I just said?
Mornin' Lynn...
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Old 01-31-2013, 08:44 AM   #6
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It took me more than 4 minutes to type my response

Mornin Patrick !!
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Old 01-31-2013, 12:10 PM   #7
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From Headlamp - Wikipedia, the free encyclopedia

The international ECE Regulations for filament headlamps[5] and for high-intensity discharge headlamps[6] specify a beam with a sharp, asymmetric cutoff preventing significant amounts of light from being cast into the eyes of drivers of preceding or oncoming cars. Control of glare is less strict in the North American SAE beam standard contained in FMVSS / CMVSS 108.[7

Headlamps for use in left-traffic countries have low-beam headlamps that "dip to the left"; the light is distributed with a downward/leftward bias to show the driver the road and signs ahead without blinding oncoming traffic. Headlamps for right-traffic countries have low beams that "dip to the right", with most of their light directed downward/rightward.
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Old 01-31-2013, 02:43 PM   #8
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That was my thought about the cutoff -- I love the bias towards the right side of the road but where my lights hit the trunk of the car in front of me, there is a 5-10 degree tilt down on the left side of both beams.

Quote:
Originally Posted by rjacobs View Post
the cutoff should look sort of like _______/ where there is a big flat area(that should be level IMO) and then at the center of the beam it angles up and to the right. I just installed the exact same lights yesterday and they were perfect from the get go, I didnt even have to adjust them at all.
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Old 01-31-2013, 02:44 PM   #9
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Quote:
Originally Posted by Patrick H View Post
If you "aimed them perfectly" you already knew about the light pattern. The intersect between horizontal and where the beam angles up is used to aim E code headlamps.

The angle is what makes them E code. They have a flat cutoff to keep from blinding oncoming traffic, and angle up on the right to light up the shoulder of the road. In Europe, they angle up to the left.
Jeep Articles / General (E-Code headlight aiming) - MoabJeeper Magazine
My "perfect aiming" was from the very short write-up on QT. I'm liking this one more -- thanks for the linker.
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Old 01-31-2013, 03:57 PM   #10
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Quote:
Originally Posted by virginian View Post
That was my thought about the cutoff -- I love the bias towards the right side of the road but where my lights hit the trunk of the car in front of me, there is a 5-10 degree tilt down on the left side of both beams.
The flat portion should be level, not angled at all. Did you get your light housings into the mounts on the jeep correctly? There are a couple tabs on the housing that go into the corresponding tabs in the mounts. Like I said I installed the SAME lights yesterday and dont have any issues.
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Old 03-09-2013, 10:47 AM   #11
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Light Pattern

(EDIT - Sorry for the rotated pics, dang iphone. Please rotate them 90 degrees clockwise in your head until I sort this out?)

So I've been searching and searching and can't seem to figure this out. I think I have a similar issue as virginian.

I ordered these Hella E-Codes from Amazon:
HELLA 002395991 7" H4 Type Single High/Low Beam Headlamp : Amazon.com : Automotive

What I received is the same part number, but the lens is opposite of what you see in the picture on Amazon. When I look at my lens, the pie/wedge shaped piece is to my right (driver's side of vehicle.)



When I turn them on, I get a dip to the driver's side of the vehicle. Since it's daytime I used a piece of cardboard held up close - you can see the dip to the left.



From everything I've read I have the correct part number in 002395991 but the lens seems backward. Can anyone with this lens confirm if I'm losing my mind or Amazon just sent me the wrong stuff?

PS I went to Daniel Stern's site and studied the lens markings - supposedly no arrow means Right hand traffic. My lenses do not have any arrows.

Any help is appreciated.
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Old 03-09-2013, 10:53 AM   #12
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The wedge shaped portion should be on the driver side, which reflects towards the passenger side, creating the wide part of the beam pattern that lights up progressively towards the shoulder of the road.
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Old 03-09-2013, 11:30 AM   #13
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Thanks Patrick. One thing that confuses me though is the dip to the driver's side in the beam pattern? Other guides I have seen show that inverted, as a rise to the right side instead of a dip to the left. I'm really trying not to over think this but I keep seeing conflicted info.
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Old 03-09-2013, 11:58 AM   #14
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The beam should be flat, horizontal, from left to center, then angle up to the right. Make sense?
Like this.
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Old 03-09-2013, 09:11 PM   #15
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Thanks for the help Patrick. I definitely have the pattern you show above. I guess what was confusing me was I was trying to sort this out during the day - holding that piece of cardboard up close gave me the angle down to the left; when I backed up to a normal distance at night everything looked fine. Now to go aim somewhere without the cops thinking I'm robbing the place.
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Old 03-09-2013, 09:17 PM   #16
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Quote:
Originally Posted by mikeclayton99 View Post
Thanks for the help Patrick. I definitely have the pattern you show above. I guess what was confusing me was I was trying to sort this out during the day - holding that piece of cardboard up close gave me the angle down to the left; when I backed up to a normal distance at night everything looked fine. Now to go aim somewhere without the cops thinking I'm robbing the place.
Yeah, my sister-in-law is a dispatcher with the local PD, so the night I aimed mine, I just told her to let patrol know what I was doing..
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Old 03-13-2013, 06:09 AM   #17
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Forgot to reply back to Patrick and company. Realized after seeing other examples that my horizontal cutoffs are so tight, I wasn't seeing them on cars ahead of me; I was only seeing the angled portion.

Loving this "mod". Thanks to all for answering my ignorance.

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