I’ve read all the threads on LED lights for the interior, and here’s what I ended up doing.
I got a bunch of different LEDs and tested them out with the clock.
To keep it simple so I did not remove the green domes, or alter the inside of the gauges in any way.
I set up the camera on a tripod and used an 8AA battery pack to power the light bulbs. I shot in RAW, the color temp is 5000K. I used the same exposure values for every shot.
Here’s a picture of all the bulbs I ended up testing.
Bulb 1
This picture is the bulb that was in the clock. Regular stock tungsten filament bulb. It might even be original. It’s pretty dim. The surprising thing is how hot the base of the bulb got when powered up for a short time.
Bulb 2
The second picture shows a bulb from superbrightleds.com.
Cool 7000K 120° 4 Lumens. BA9s
https://www.superbrightleds.com/moreinfo/ba9s-ba7s/ba9s-led-bulb-1-led-ba9s-retrofit-car/3/
It’s noticeably brighter than the stock bulb.
Bulb 3
The third picture shows a bulb from superbrightleds.com.
Cool 5500K 270° 40 Lumens. BA9s
https://www.superbrightleds.com/moreinfo/ba9s-ba7s/ba9s-led-bulb-1-led-ba9s-retrofit-car/958/2359/
I shaved the plastic end down with a Dremel so the bulb would fit inside the green dome. Looks pretty good.
Bulb 4
The fourth picture shows a bulb from superbrightleds.com.
Green 40 Lumens. BA9s
https://www.superbrightleds.com/moreinfo/ba9s-ba7s/ba9s-led-bulb-5-smd-led-tower-ba9s-retrofit-car/2077/
This bulb did not fit inside the green plastic dome. To take the picture I taped it in place with as much of the bulb in the dome as possible. The color was too green for my taste.
Bulb 5
The fifth picture shows a bulb from superbrightleds.com.
Cool 6100K 96 Lumens. BA9s
https://www.superbrightleds.com/moreinfo/ba9s-ba7s/ba9s-led-bulb-5-smd-led-tower-ba9s-retrofit-car/2077/#/attributes/10855
This bulb is the same as the previous bulb, but cool white instead of green. To take the picture I taped it in place with as much of the bulb in the dome as possible.
Bulb 6
The sixth picture shows a bulb from amazon.com
White. BA9s
https://www.amazon.com/64111-3-7020-Lights-Extremely-Bright/dp/B01MEFGAAI/ref=sr_1_3?ie=UTF8&qid=1505518231&sr=8-3&keywords=ba9s+LED
This bulb came in a four pack. I decided to try this bulb since it was cheap. It’s nice and bright. Close to the same brightness as the 96 Lumen white bulb from superbrightleds.com. It surprised me how evenly this style of bulb illuminated the clock. I like this one the best so far.
Bulb 7
The seventh picture shows a bulb from amazon.com
White. BA9s
https://www.amazon.com/gp/product/B01MQOXU74/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1
This bulb came in a 10 pack. It is bright but not as bright as the bulb in the sixth picture.
Bulb 6 in the speedometer
Overall I went with bulb number six. Here’s a picture of my speedometer with that bulb. It lights up nice and bright.
Here’s a picture of the clock powered up and resting on the dash of my jeep. Overall it’s about the same brightness feel to the jeep gauges on full brightness setting. The dimmer in my 280z did not dim the LED bulbs at all. It’s either full brightness or off.
I also put LED bulbs in the turn signal indicators, high beam indicator, and brake warning light in the gauges. I tried a couple different bulbs but forgot to take pictures.
I don’t have everything put back together yet, but when I do I’ll update with a pic of all the gauges lit up in the car.