++ ATOT official NEF thread part IV ++

[MotF Bane]

Nef!

 

[IndyColtsFan]

House has been dusted. NEF!

 

[zzuupp]

nef

 

[MotF Bane]

I just read "99th Gray Cup" as "Sasha Grey".

Whoa.

 

[eldorado99]

ned

 

[MotF Bane]

Nef.

 

[MotF Bane]

Nef.

 

[MotF Bane]

ALFA!

http://www.hidplanet.com/forums/showthread.php?36843-How-To-Mini-H1-on-8th-gen-Civic-Sedan

Did you see that?

 

[alfa147x]

Well, alfa, I hope you ordered last night. If you didn't, you'll have to email them about it.

Their sale said "Thursday through Sunday", but they seem to have cut it last night at midnight. An email might work though, because the terms did clearly say "through".

Damn it. I was going to order today


°

 

[Rubycon]

ALFA!

http://www.hidplanet.com/forums/showthread.php?36843-How-To-Mini-H1-on-8th-gen-Civic-Sedan

Did you see that?

You boys and your toys. Lot of trouble to mess with lights.

But yes I did see it and did you notice the last picture?

While the cutoff seems acceptable there's a lot of chromatic aberration (blue fringing) going on that will be quite noticeable (annoyingly distracting!) to the oncoming drivers. There will be a brief and intense blue flash just as the main beam area comes into field of view. A properly designed projector does not exhibit this characteristic. Optical design is a very specific discipline and when non engineers work with these things often less than stellar - and downright hazardous results - are frequent.

Note that this *is* nit picking here as many users' results are FAR worse than pictured but the picture shows this characteristic quite well.

 

[MotF Bane]

Narf.

 

[MotF Bane]

Damn it. I was going to order today


°

Try emailing your order, and reference coupon code TRS-Turkey25

 

[alfa147x]

Try emailing your order, and reference coupon code TRS-Turkey25

I'll have to do that. I was being lazy last night. Damn it

Thanks man


°

 

[MotF Bane]

You boys and your toys. Lot of trouble to mess with lights.

But yes I did see it and did you notice the last picture?

While the cutoff seems acceptable there's a lot of chromatic aberration (blue fringing) going on that will be quite noticeable (annoyingly distracting!) to the oncoming drivers. There will be a brief and intense blue flash just as the main beam area comes into field of view. A properly designed projector does not exhibit this characteristic. Optical design is a very specific discipline and when non engineers work with these things often less than stellar - and downright hazardous results - are frequent.

Note that this *is* nit picking here as many users' results are FAR worse than pictured but the picture shows this characteristic quite well.

1) That is a "colorful cutoff", and to most users at HIDP, it is a desirable effect.
2) The main beam is to be below other driver's view, except when hills or bumps are involved.
3) If I'm applying physics of light correctly, that's fringing from the metal cutoff shield inside the projector. It is not an indicator of a poorly designed projector, it is an inherent feature of creating a highly focused projector with a cutoff shield as required for automotive usage.
4) Most factory solutions (except for Acura) use fresnel lenses, which blur that cutoff and remove the blue. However, fresnel lenses reduce total output by 10-20%, which is also an undesirable effect.

 

[MotF Bane]

You can reduce the cutoff inside the projector by painting the shield with a high temperature black paint, but that makes the projectors look strange (the lenses appear black), and it still doesn't eliminate the fringing.

 

[MotF Bane]

Most people, especially as they age, do not like sharp cutoff edges, which is another reason for fresnel lenses - they blur the cutoff to a softer line.

 

[Rubycon]

I see lights with colorful cutoff [sic] and it's annoying.

I have lots of experience in this field with theatre lighting and our lights cut off perfectly with no distortion. Only a coherent source (laser) is more precise.

Products of "shade tree" work will be just that.

Speaking of cutoff...wtf happened to my avatar?

 

[MotF Bane]

Nefresh.

 

[Rubycon]

The picture I posted is very sharp cutoff just has excessive chromatic aberration near the line. Refraction of the source causes this and due to the blue peaks in the source it gets highly augmented.

 

[MotF Bane]

I see lights with colorful cutoff [sic] and it's annoying.

I have lots of experience in this field with theatre lighting and our lights cut off perfectly with no distortion. Only a coherent source (laser) is more precise.

Products of "shade tree" work will be just that.

Speaking of cutoff...wtf happened to my avatar?

I still prefer your older avatar, might've been the one with Winfrey. If you did not intend that result shown, upload it again, it probably got a connection problem during the upload, also confirm your source file isn't corrupt.

These projectors are not shade tree work. They're either done by engineers working for major car manufacturers, or rather precise imitations of their designs.

Theater lights are very different from automotive projectors, and aren't most of them in black enclosures? Might be something to that black enclosure, eating up colorful fringing.

 

[MotF Bane]

The picture I posted is very sharp cutoff just has excessive chromatic aberration near the line. Refraction of the source causes this and due to the blue peaks in the source it gets highly augmented.

Refraction... so, the light going around the metal shield.

 

[MotF Bane]

Narf.

 

[MotF Bane]

I do not particularly want a razor sharp cutoff or the blue fringing myself, but I am unwilling to use fresnel lenses and thereby sacrifice maximum light output.

 

[MotF Bane]

Nef.

 

[eldorado99]

dingfriesaredone