Twood

I have to replace a couple of light bulbs in my number plate lights and was considering changing to LED type bulbs. I was wondering if there existed a list of the light bulbs in a 964. I know I am just being lazy but rather than going through the whole car including instrument lights I thought there may be a list that I could use?
I checked the PET but could not see anything there.

Otherwise if there is nothing I will make a list for others to use that maybe considering doing the same.

Vandit

You can read through my thread from last year regarding interior lights (not instrumentation) and brake/marker lights.

https://rennlist.com/rennforums/showthread.php?t=724399

Mr.Alex

I changed to LED plate lights. They are a very bright pure white and I feel like they increase the visibility of the car at night.

Twood

I am going through the exercise now and this is what I have come up with. It seems that there is a different name or number for many of the lights so if anyone can clarify or correct what I have it would be appreciated.
Is there a LED equivalent for the instrument lights. Like Vandit I have discovered I have a light in the engine bay that I had forgotten about.

Copied and pasted from Excel so not all headings line up perfectly

Back
Application Bulb Size

2 Number Plate 233 T4W BA9S 1895
2 Stop/Tail 380 P21/5W T25 1157
2 Rear Indicator 382 P21W BA15S 1156
2 Rear Fog 382 P21W BA15S 1156
2 Reversing Lights 382 P21W BA15S 1156
Reversing 382
Front
Application Bulb Size
2 Sidelight 233 T4W BA9S 1895
2 Front Indicator 382 P21W BA15S 1156
2 Side flashing light 12V 5W 7443 5W
2 Park light front 233 T4W BA9S 1895

Interior Application Bulb Size
2 Interior 265 12 SMD LED Festoon Bulb Light Lamp 44mm
Instruments
Dashboard

Other Application Bulb Size
1 Engine bay 265 12 SMD LED Festoon Bulb Light Lamp 44mm
1 Luggage Bay 265 12 SMD LED Festoon Bulb Light Lamp 44mm

Vandit

Also keep in mind that LEDs on the turn signals will cause the signals to flash very quickly.

Also, not all dual Intensity lights are equal, so you may run into a bulb whose brightness doesn't adequately differentiate taillight from taillight+brake.

Also, match the LED color to the lens color.

Twood

Learn from others experience is always good value

Also keep in mind that LEDs on the turn signals will cause the signals to flash very quickly.

Is there any way around this other than buying a new flasher unit?

Also, not all dual Intensity lights are equal, so you may run into a bulb whose brightness doesn't adequately differentiate taillight from taillight+brake.

Stop/Tail 380 P21/5W T25 1157 Do you know if this is the case with this bulb or does it vary according to supplier?

Also, match the LED colour to the lens colour.

I was going with all white bulbs and allow the lens colour to create the colour? Is this wrong?

So much to learn when it seemed so simple to begin with. I will post what I learn.

Vandit

I believe they sell LED flasher modules to slow the hyper blinking. Never tried out tho and I don't run LEDs on my indicators.

I believe the dual intensity LEDs I got from superbrightleds.com were pretty good about differentiating between intensities, comparable to the filament bulbs. The cheaper ones from dx.com were not.

I don't know how to explain the science behind difference in color wavelengths and color spectrum between an LED and a filament bulb, but the basic rule w/ LED bulbs is that you always match the color of the lens, otherwise you get very poor light output. Taillights, you'll want red LEDs. Marker lights, orange LEDs. Et cetera.

Twood

Thanks Vandit - I am on the superbrightleds website - they have the information I need.

JasonAndreas

Most lighting manufacturers have application/cross-reference lists. ex Sylvania

964Luftballoon

Sorry to bump a very old thread. Are the bulbs listed for RoW cars? I just recently picked up a 91 C4 and my license plate bulb is not a 3893 as suggested by sylvania and super bright LEDs. They were actually festoon type same as the Dome light bulb.