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Using LED's for taillight clusters


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That is AWSOME!

 

The bleed over is very minimal from what I can tell in the pictures. You did an excellent job. Those look very bright even from the angles.

 

I'm about to come into a pair of extra '82 ZX tail lights that I'm very seriously considering using trying this mod.

 

A list of part's and their sources would be greatly appreciated.

 

Thanks and again great job!

 

Cheers,

WW

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Cool!

 

I bought a bunch of white LED's off eBay with the intention of using them to light my interior. My thought was that red LED's emit well through the red plastic brake light lens and they give it a blood-red color, in addition to being less than 1/2 the price of white ones (last time I checked).

 

I'm glad someone is further along than I am on the project. It's actually been so long since I worked on it, I don't remember whether the LED's are still in place, or if I put the incandescent bulbs back in! How's that for lack of commitment to a project?

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  • 2 weeks later...

AWESOME JOB!!! Man, I'm so glad to finally see a finished product! My offer still stands '180SX, I am totally inept at electrical tasks, and would happily pay for someone to do this conversion. They look perfect!

I read this entire thread through many times. Never understood why people were looking for RED LEDs for their red lensed assemblies. It would be guaranteed to diminish the visible light (red bulb coating behind red plastic = double color/filter). It seems that the ONLY way to maximize the emitted light is to go with white LEDs. It may cost more; but, if you're going to do it, don't ya have to do it right?!

It has been a while; but, I'm going to try to order the LEDs from that eBay source. How many total do you require for both light assemblies? I've been in touch with the seller from eBay. He doesn't have that particular deal anymore; but, he has 500 pcs of 10k mcd for $95 + shipping and 'handling' (hate that 'handling BS!). So, please advise ASAP how many lights it takes to do the entire tail light assembly. Thanks!

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Never understood why people were looking for RED LEDs for their red lensed assemblies. It would be guaranteed to diminish the visible light (red bulb coating behind red plastic = double color/filter). It seems that the ONLY way to maximize the emitted light is to go with white LEDs. It may cost more; but, if you're going to do it, don't ya have to do it right?!

 

:P

 

http://electronics.howstuffworks.com/led.htm

 

Maybe that will shed some light on it for you.

(boo, hiss)

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Yeah, red LED's are the brightest. When you buy super bright LED's, they list the measurement of how bright they are. I just bought a bunch of white ones because they're bright enough (obviously) and its easier to mount them in any color lense I want to.

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I was wondering if white ones are really necessary for red tail lights, (or yellow turn signals, for that matter). I either remembered from my physics class or guessed what was going on with the tail light lense color correctly - after I googled a bit, I affirmed my suspision - the color of the lense acts as a bandpass filter, not necessarily severely attenuating the color of light that's in it's "band".

 

(See the second paragraph under "Optical filters" : http://www.imagineeringezine.com/ttaoc/lightpro.html#8 )

 

What that means is that if the light coming out of the LED is red and the lense is a true bandpass filter with ideally zero attenuation for the same red color, then the light from a red LED of X mcd will shine just as brightly through the lense as a white LED of X mcd. Of course, in reality no lense will have zero attenuation, even a clear one that isn't acting to filter out certain visible wavelengths, by design.

 

Of course the other issue is whether the bandpass wavelength of the Z's red taillight lense matches the wavelength of the typical Red LED (~590nm). It's probably close enough...

 

Another issue that I found was a problem with using white LEDs in red lensed lights:

http://www.iguanamotors.com/faq.cfm

(search for "My incandescent bulb is clear, why do I need a colored LED?")

In other words, white LEDs don't necessarily put out anything close to an "even" spectrum of visible light like incandescents do, so don't expect colored lenses to filter their output like they do for incandescent lights.

 

Their response:

"Previously, the lack of white-light LEDs has limited the integration of LEDs into a wide range of applications; however, now, the misconception exists that InGaN-white LEDs can illuminate a lens of any color thereby simplifying lighting requirements and designs. Wrong! Since the color red is not represented in the white LED, white LEDs can only be used behind a clear or milky white lens or panel. Place a white LED behind a red lens and the light produced is a pink color, a yellow lens turns a lemon-lime, green lens shifts to aqua and orange lens becomes yellow. To maintain accurate and brilliant colors, it is imperative to match the LED color with the lens color. In short, white LEDs made from a blue chip cannot be used as a general backlighting light source for different colored lenses and panels."

 

This is backed up by a tech article on Sunbrite's site:

http://www.sunbriteleds.com/articles/index.asp?file=Led_VS_Incandescent.htm

 

" For signage applications it is important to match the color of the sign face with the color of the LED to optimize lighting performance and color."

Now, that's interesting! I was noticing that the white LEDs through the red lense shown in this thread looked pink, but thought it was a computer graphics issue.

 

Oh well, I guess my Yellow and Red $7/ea LED type 1157 replacements from Newark were a good way to go anyway, over the $19/ea White ones.

(I have Euro 240Z tail lights I'm going to try them in.)

 

They are 47000mcd-48500mcd in the bright mode, with a 30 degree viewing angle. As noted, I think that will be fine since the lense is a diffuser also. They're Sunbrite 11 LED jobs:

http://www.sunbriteleds.com/product.asp?id=127

 

I'm hoping they'll be bright enough, but if not, I'll consider opening the housings to install arrays - of yellow and red LEDs.

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This is one of those times that I'm really glad to be corrected. It would have been a shame to invest in this type of conversion only to end up with distorted light because of my misconception that white LEDs would be best. Glad to learn the truth......

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The pictures posted don't look too distorted...to me anyway. I mean, the inside of the lens is textured to allow incandescent light to fill the whole assembly right? Modern cars (not all of them) using LEDs as OEM have lenses that appear to be flatter and clearer (they don't have that bumpy pyramid-shaped texture on the inside).

 

So, for 30 year old lenses, that may have or have not been cleaned up, and using a different light focusing technique, the results don't look too bad. If I ever do follow thru with my tail lite project, I plan to make brand new lenses somehow.

Owen

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It's just a computer graphics issue. My lights don't look pink in person.

 

If you look at the pics I took of the turn signal lit up, you can see it is plainly red and not shining pink.

 

DSC00949.JPG

 

 

DSC00951.JPG

 

 

 

The problem with the photos is that my digital camera sucks, and I was taking pictures of a light that was lit up... Common sense says it ain't gonna look right. :-D

 

Don't be afraid of white LED's. These ones are showing through the red extremely bright and pure red. I assure you.

 

I think I did say that the pics don't do the lights any justice... :)

 

 

Another thing is you can adjust the distance at which you set the LED's behind the lense to adjust how clearly you can see each LED. If you put them back another half inch or so from where I have them in those pictures, they will be much harder to make out.

 

EDIT: If I was starting over at this, I would use red LED's in the housings, though... just because the LED's themselves are brighter. I used all white to simplify ordering the things.

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  • 4 weeks later...
Yeah, red LED's are the brightest. When you buy super bright LED's, they list the measurement of how bright they are. I just bought a bunch of white ones because they're bright enough (obviously) and its easier to mount them in any color lense I want to.

 

Lots of times you can actually buy brighter green LEDs than any other color, not that that is useful for THIS. And you should be able to find whites just as bright as reds... both around 10,000mcd can be found.

 

Here are some bright ones. This site is a very good LED source.. used to use them for non-car projects... http://www.eled.com/%5CSearchResult.asp?wavelengthlogic=%3D&wavelength=&viewinganglelogic=%3D&viewingangle=&LuminousIntensitylogic=%3E&LuminousIntensity=2800&chk5mm=ON&Search=Search&CategoryName=Mega+Bright+LED

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