LED Brake Lights

[spoke]

Here's the same visual clip shot in the early morning.

The 2 rows of side marker LEDs (16 in all) are noticable in this video when I stand on either side of the car. I would like to still use a light bulb or LED light in the existing sidemarker bulb socket then dedicate the entire turnsignal board to turnsignal LEDs.

[dfhtrhjn]

For those that have the 911R tail lights that use festoon bulbs, these are the brightest LED bulbs I've found.

Amazon.com: Jtech 4x 42mm(1.72") 16-SMD DC 12V Super Bright White LED Bulb 211, 212, 211-2, 212-2, 214-2, 560, 569, 578, 6413, 6429 etc.: Automotive

[PabloX]

Originally Posted by dfhtrhjn

For those that have the 911R tail lights that use festoon bulbs, these are the brightest LED bulbs I've found.

Amazon.com: Jtech 4x 42mm(1.72") 16-SMD DC 12V Super Bright White LED Bulb 211, 212, 211-2, 212-2, 214-2, 560, 569, 578, 6413, 6429 etc.: Automotive

Have you tried them with the interior lights? If so, which size?

Thanks.

Spoke, those look really good.

[Taxi!]

I just installed the LED brake light boards that I bought from Jerry and I want to express how impressed I am with his workmanship and attention to detail. This is truly a plug-and-play upgrade that no one else offers. He's obviously thought this through, from the LED boards to the mounting mechanism, and his ingenuity represents what's great about this forum. He even has a YouTube video that explains the rather simple installation process.

Unfortunately, after plugging in the first LED board and then testing it, I discovered that none of my brake lights are working, including the third brake light I installed last year. When this happened a year or so ago I traced it down to a faulty brake light switch so will try to figure this out tomorrow. I have no doubt that once I replace the brake light switch (or fuse) Jerry's LED lights will work perfectly.

[DRACO A5OG]

Spoke, you have one sweet 930 sir .

If I may ask, for the turn signals in your video, what are the angles of the light emitted from each LED? Is it me or do the LEDs have too narrow of a beam.

Night driving will be absolutely no issue but at certain times of the day the LED's sharp cut off or dead spots could be a issue, no? A PITA PoPo/DMV worker may have a problem due to lack full illumination of the turn signal lens during the day, with the sun in the background, like dusk or dawn? I hate to be the one to rain on the parade but I am just wondering?

I was behind a car that had aftermarket LEDs on the freeway, our lovely 101 FWY going west at certain spots so happens to have the sun setting right in our eyes, I swear I could not see his lights.

[spoke]

Good points. Let me address these one at a time.

DMV issues:
There is a disclaimer on the boards that these may not meet DOT specifications. I don't have the resources to have these tested and certified. The boards are easily removed if needed for inspection or even for concours shows. Any problems with DMV inspection; remove the lens; remove the boards; pop in standard bulb and you're good to go.

Tight LED 1/2 power angle:
When I first started building these the only Cree C503B-RAN LEDs available in quantity are the 15 degree LED which are on the boards. There is some dispersion via the lens.

I've noticed lately that the 30 degree C503B-RCN LEDs are now available in quantity. Same amount of light but more dispersed. This means less light directly behind the vehicle with more light at wider angles behind the vehicle. I will try these LEDs on the next batch of boards.

I detailed the dispersion comparison of the standard bulb and the 15 degree LEDs in the first post of this thread. Here's another way to visualize the dispersion. This graph shows the amount of light from the 15 degree 911 brake LED board given off behind the car compared to the standard bulb. For brakes where the dude who's going to rear-end your car is directly behind you, this is probably ok. For turnsignals a wider dispersion may be desirable.



Now compare the previous 911 brake dispersion with this one from a 914 front LED board with 30 degree LEDs. These boards are much brighter (6x) than the standard bulb mainly because there are 69 LEDs whereas the 911 brake LED has 48 LEDs and the bulb orientation in the 914 front turnsignal bucket.



About the 930: Thanks. It is a really fun car to drive. I purchased the car a couple of years ago from a Pelican ad:

http://forums.pelicanparts.com/porsche-cars-sale/462787-1986-911-turbo-930-sale.html

Originally Posted by DRACO A5OG

Spoke, you have one sweet 930 sir .

If I may ask, for the turn signals in your video, what are the angles of the light emitted from each LED? Is it me or do the LEDs have too narrow of a beam.

Night driving will be absolutely no issue but at certain times of the day the LED's sharp cut off or dead spots could be a issue, no? A PITA PoPo/DMV worker may have a problem due to lack full illumination of the turn signal lens during the day, with the sun in the background, like dusk or dawn? I hate to be the one to rain on the parade but I am just wondering?

I was behind a car that had aftermarket LEDs on the freeway, our lovely 101 FWY going west at certain spots so happens to have the sun setting right in our eyes, I swear I could not see his lights.

[DRACO A5OG]

Excellent Response, Thank you. I may just have to get a set as well

BTW, that was a Sweet Deal, wow.

[honjgbe]

That looks great to me! I assume some of the leds are on for tail, and all on for stop? Or they all on but dimmer? How are you connected to the original socket? A double pole one/way bulb base? Something like this is readily available, but yours looks to fit the 911 reflector aperture exactly - very nice. How much for a set?

[spoke]

Originally Posted by honjgbe

That looks great to me! I assume some of the leds are on for tail, and all on for stop? Or they all on but dimmer? How are you connected to the original socket? A double pole one/way bulb base? Something like this is readily available, but yours looks to fit the 911 reflector aperture exactly - very nice. How much for a set?

There are a bunch of plug-in LED replacement lamps on the market for both the brake and turnsignals. Some aren't too shabby. My goal is to make the brightest LED solutions and make it look like the PCB was designed into the car.

All of the LEDs are on for running lights as well as for brakes or turnsignals. Current for brakes/turnsignals in each LED is 20ma and for running lights is 4ma per LED.

The boards plug directly into the existing bulb sockets. For the brakes it is a 1157 (BAY15D) bulb base and for turnsignals it is a 1156 (BA15S). A pigtail wire connects the bulb base to the PCB. A small piece of PCB is inserted in the bulb base and epoxied in to act as a handle to ease inserting the bulb base in the socket.

[RyanG]

I'm interested in a set whenever you get around to making your next batch.

[Porsche 2]

Spoke, will you be making one to fit the third "periscope" brake light (Cab.)?

[Cayman S]

I will take a set!! Just PM me when you are ready to ship...
Thanks
David

[Doug-DBP]

I will take a set when you are ready.
Thanks
Doug

[wildthing]

Is there a difference between the 1157 and the 7528?

When I search for regular bulbs for an 88, it says I need a 7528, which seems to be for a more recent Euro standard.

[A horse with no name]

Originally Posted by Porsche 2

Spoke, will you be making one to fit the third "periscope" brake light (Cab.)?

+Dido

[jinhomh]

I'm all up for anything that makes the brake lights more visible with so many distracted drivers out there. I'd be interested in a set, or more if they also fit 914s as well.

[spoke]

Originally Posted by A horse with no name

+Dido

I haven't considered making an LED board for the periscope. Does the lens come off like the regular brake lights?

[spoke]

Originally Posted by wildthing

Is there a difference between the 1157 and the 7528?

When I search for regular bulbs for an 88, it says I need a 7528, which seems to be for a more recent Euro standard.

I found this information about 1157 vs 7528. The 7528 burns less power on the bright filament than the 1157. Maybe that's why 914's with plastic brake light enclosures are melted as people swapped higher power 1157's instead of the proper 7528's.

P21-5W/12V/21W/5W/BAY15D ECE bulb specifications:
category: MINIATURE
volt: 12
amp: 1.75 / .417
watt: 21 / 5
base: BAY15d - Double Contact Index Bayonet
glass: S8
filament: C6/C6
fil.res.: 6.86 / 28.8 ohm
m.o.l.: 2 inches
l.c.l.: 1.25 inches


1157 USA bulb specifications:
category: MINIATURE
volt: 12.8 / 14
amp: 2.5 / .214
watt: 32 / 3
base: BAY15d - Double Contact Index Bayonet
glass: S8
filament: C6/C6
fil.res.: 5.12 / 65.4 ohm
m.o.l.: 2 inches
l.c.l.: 1.25 inches


Comparison of other bulbs.

[wildthing]

Ok so if I am reading that correctly, it only matters on traditional light bulbs with filaments, and there is no difference in the socket.

In that case, I will take a set whenever you have one...

[Porsche 2]

The top of the periscope brake light is easily removable, exposing all of the area under it, see photo attached.