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> LED Taillights, Custom Made for the 914
914coop
post Jan 27 2014, 07:02 PM
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I'll take a set.

Thank's Irv
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sportlicherFahrer
post Jan 27 2014, 08:58 PM
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+1
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cconcepcion
post Jan 31 2014, 09:32 PM
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I'm in for a set as well.
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Cairo94507
post Feb 1 2014, 07:49 AM
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You know I am going to have a set of these for my car. We just are not ready for them yet...
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dw914six
post Feb 1 2014, 08:25 AM
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Looks great. I will take 1 set.
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Spoke
post Feb 5 2014, 08:43 PM
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An update on the 5mm LED lights; I have been testing the prototype set of 5mm LEDs to understand the temperature rise when the brakes are applied. This is the highest power dissipation state and will generate the highest temperatures.

The prototype with 63 LEDs and maximum current runs very hot. I've measured temperatures over 100C which is way too high. I've cut the current down a bit but the circuit still runs very hot.

My goal is to keep the temps about 40C above ambient. To do this, I had to turn off 12 of the LEDs to reduce the power dissipation. Now the circuit runs around 60C (room temp is 23C).

Even with the reduced current and number of LEDs, the circuit still puts out way more light than the 1157 bulb and is on par with the CREE board.

With this info, I decided to reduce the number of LEDs to 48 which will still give a wall of light. The board is about 1/4 inch taller than the prototype should work well.

I need to test this board out so I will build only 1 pair to begin with so I can evaluate the thermal performance of the unit.

Sorry for the delay but I need to make sure these work well before doing any mass building.


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smj
post Feb 21 2014, 03:24 AM
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Glad to hear you're double checking the heat dissipation. I need a set, just want to see which variant you actually get fabbed.
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Spoke
post Feb 23 2014, 07:49 PM
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I built one PCB with high power Cree amber LEDs to use as turnsignals.

The PCB was mounted in the turnsignal housing using brass clips. The one on the end is quite long and doesn't hold the board as tight as the brake light.

Attached Image

This pic shows the skew of the boards in the housing so that they're pointed directly behind the car. If made on one board, the brake lights would be quite deep in the housing.

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Spoke
post Feb 23 2014, 07:57 PM
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When I built the Cree amber board, I didn't think the LEDs were quite as bright as the red LEDs so I increased the current to 70ma (brake lights are at 40mA).

Here's a comparison of the original turnsignal bulb and the amber Cree LEDs.

I think I went too far with 70ma. It is very bright.


https://www.youtube.com/watch?v=Mxb6IvHO_SA


Here's what the turnsignal light looks like with just parking lights on. I'm only running about 3ma in the LEDs. These put out about as much light rearward as the little side light does.


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Spoke
post Feb 23 2014, 08:01 PM
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About the 5mm boards, I found a Cree LED which should put out as much light as the Vishays but with a wider 1/2 power angle. I ordered the Cree LEDs and will build one more board and test it. Sorry for the delay but I want to make sure the board is a good as can be for everyone.
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Cairo94507
post Feb 23 2014, 08:08 PM
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I just love that you are addressing the brake and turn signals will you also do the taillight? That way the whole rear will be LED's.

I am definitely down for a set of these when you get the final version done and Scotty tells me it is time for taillight assembly. (IMG:style_emoticons/default/smilie_pokal.gif)
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monkeyboy
post Feb 24 2014, 10:31 AM
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I am even more excited now.

I would recommend front turn signals, and the option of the side lights as well.

I would love to go full LED. Headlights, and Fog Lights included. I will one day.
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cary
post Feb 25 2014, 08:14 AM
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I'm in for a set when your ready.
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barebrad
post Feb 25 2014, 11:59 AM
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+1 (Brake)
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Kansas 914
post Feb 25 2014, 12:05 PM
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I would love to be able to "show off" my LED taillights at Route 66 Classic March 21st.... But I will be patient.

It would go well with my LED front turn signals.


https://www.youtube.com/watch?v=PAgCELfdMeM
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shawn914
post Feb 25 2014, 05:59 PM
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Will take a set when ready.
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kid914
post Feb 25 2014, 06:09 PM
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might be in for 1
thank
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Cairo94507
post Feb 25 2014, 06:25 PM
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I have to agree with monkey boy - it would be crazy cool to be able to convert all of the lights to LED! (IMG:style_emoticons/default/piratenanner.gif) I would totally be in for that.
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VaccaRabite
post Feb 25 2014, 07:15 PM
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Spoke, I'm in for a set when you are ready. These are fantastic.
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Harpo
post Feb 26 2014, 05:39 AM
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Very impressive
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