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Discussion Starter · #1 ·
So, I'm trying to add lights to the numbers of my cars. Like this number 4
5387Seb14Vette4night-700x420.jpg


So, I tried just adding an LED behind the number, and it's pretty good, but you can still see the individual LED's, which looks a bit funky.

So I was looking at iPhone logo light ups like this... Logo Light for LED This seems to give a really good, consistent glow to the logo, which makes me hopeful that they could work for number lights.

So it looks like these just use side light LEDs and some sort of diffraction grating? Anybody have a better idea of how this works?

Thanks,

Heath
 

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I has messed around with the side lights also. I never finished one.

My testing was done by painting the inside of the car around the number.

Then I added a chip led. I was trying to find the best way to mount it in the body.

I always try to remove all the bleed possible so the car is not glowing.

I did see German Design company at one time that had a full light kit with side lights and even dome lights.

Shad
 

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These look a fun find... maybe some kind of embossed leaky optical waveguide... lots in parallel... embossed rather than photolith tprinted to keep costs down... just a thought?

Need to check out the technology used in side-lit LED TVs...

C
 

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Discussion Starter · #5 ·
I know tamar.nelwan on the forum here has done them for the DiSCA races.

Shad
Actually, that's where I stole the LED idea from. They look okay, and if I put the LED's a bit back from the number, it looks better, but I was hoping for a better dispersion of light. I also like how the iPhone one's are so thin, like they could be just stuck on the inside side of the car. Super quick and easy.

Thanks Shad.

These look a fun find... maybe some kind of embossed leaky optical waveguide... lots in parallel... embossed rather than photolith tprinted to keep costs down... just a thought?

C
Maybe. Any idea where I could source something like that?

Thanks Dr. C.
 

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Heath... these look such fun I just ordered two intended for the iphone 6S as per your link... I have no doubt they could be powered off an incar decoder via some appropriate resistor...

C
 

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Discussion Starter · #8 ·
Looks like a cool project Shad. At some point I would like to do the car position LED (like the 21 on the Corvette above) , but I have so many other projects going on.

Heath
 

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Discussion Starter · #13 ·
Thanks Gio. Now I am remembering now. Since I am not painting the outside of these cars, maybe I will make a reverse mask for the inside of the car.
 

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Hello Guys
What a coincidence. Just the subject I'm currently working on.
Here are links to two post I made on this subject in my Scaleauto Porsche 991 Disca GT3- & GTE thread.

IMG_7720.jpg


https://www.slotforum.com/forums/index.php?showtopic=135594&p=1782730

https://www.slotforum.com/forums/index.php?showtopic=135594&p=1787666

IMG_7571a.jpg


As Grunz remembered correctly, I chose to mask the numbers and only illimunated the numbers, not the complete shield (which would have been more scale correct)
On the left the first test with just one led, not happy with that, so in the middle used two leds, one for each number. The result can be seen on the right image and on the main picture above.

But this was 4 years ago, and progress has been made
wink.png

I've been working on the light set up for the Mission 8 GTE and have found led's that are much better suited for the job.
The problem is not getting enough light trough the body and number shield, the problem is getting the right amount of diffused light in the shield and no light seeping through around the shield.

First thing first, during research for the lights I'm doing now I discovered these 5630 SMD led's from store.brightcomponents.co.uk
As the name indicates they measure 5,6 mm x 3,0 mm. So two of them side by side will perfectly light up the whole number shield panel.
The way I will mount them in the body will be by use of 0,5 mm thick transparent double sided tape. This will diffuse the light even more.
(Only the backing tape is red, the tape itself is clear)
Thinnest-smd-led02.png


The problem of containing the light of the led's to just the panel can easily be done by masking of the surrounding area.
As I wrote in my original post, on prepainted cars you would need to do this on the inside of the body. For dark cars mask off the shield and paint the surrounding area black.
On light colored cars I would use silver. You could also use thin foil like bare metal foil. (at least on the inside)

As for Flagstaff's desire to do the position lights (like on IMSA cars) I have discovered these from ledbaron.de

These are just 0,4mm wide and 3,8 mm long, so small enough to form the position light matrix, but you'll need 7 led's per number....and very good eyes.
That is if you want to be able to make double digit shields..your main problem here will be how to control them..ardino micro?

Thinnest-smd-led.png

On the left the LED MICRO PLCC2 010 PUR WEISS from led baron.de. On the right both the PLCC2 colored with a drop off Tamiya clear. You can also see two 5630 smd leds mounted in the body for the M8 foglights.

If you are happy with a fixed number you can get away with 1- 5 smd's (the easiest number off course being postion 1)
These micro SMD's can be ordered pre wired, with wires ranging from thin to absolutely ridiculous thin (motor armature wire)
Unfortunately they're only available in white.....but with a drop of Tamiya clear, you can color them yellow, or red or any color you like.

Hope this helps you guys with your projects
wink.png


With kind regards
Tamar
 

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Discussion Starter · #15 ·
Thanks so much Tamar.

Unfortunately, I just realized that a backlit Number plate will not work for a good many of them as they use a colored plastic for the base color. Grey, white, black plastics would work, but probably not blues and reds. :( so I guess we are back to Shads suggestion of a Arduino powered OLED screen.
 

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That would be correct for Cars from the pre LED age, such lights were common in the Gr C area. At the turn of the century Luminesent (fluorescent?) panels became en vogue.
The first led panels/shield were seen at the 2010 LM 24hrs

5761e43ba7a67.jpeg

image courtesy of lemans.org
 

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I had thought about using glow in the dark paint on the numbers but never got around to trying it mostly due to the fact that I don't remember the last time I raced in a night race.

Could be a low tech way to do it.
 

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Glow in the dark paint has been used, tried and tested successfully but you need UV neon light in the room to make it work. And when you have those (blacklight neon) , simple paper stickers will light up white numbershields.
How's that for low tech for ya...if you don't mind racing in Disco light
biggrin.png
 

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Thinking back to potential uses for SSD aux packets... how about a green number glow for the race leader (as per S/F line at previous lap) and blue number glow for the rest of the race pack?

C
 
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