If I recall correctly from when I changed mine over to LEDs, there are some vents on the top of the instrument binnacle that allow the heat from the conventional bulbs to escape, and they allow light to escape as well. I also think there is a Mercedes Source video on this, and the solution I used was to cover the vents with aluminum tape so that the light would be reflected back to the instrument cluster face. It worked pretty well.
From: brian's 83 300d's <bstromsoe@yahoo.com>
To: diesel_mercedes@yahoogroups.com
Sent: Sunday, February 9, 2014 8:08 AM
Subject: [diesel_mercedes] Re: INSTRUMENT CLUSTER LIGHTING
I seem to remember an article on the tube that channels the light from the bulb. Maybe it was a Mercedes Source video, yes it was now that I think about it. He may have cleaned the tube or lined it with aluminum foil or something to get some brightness. Let us know how you solve it.
--- In diesel_mercedes@yahoogroups.com, Bogy Wan Kenobi <polespearbogy@...> wrote:
>
> Hi all:
>
> I decided to try to do something about the annoyingly dim panel lighting in my 300TD. To that end I got a couple of light sockets and "wired up" some super bright LEDs. I tested them on the workbench at 12 volts (regulated) and almost blinded myself. But when I put them in the sockets of the instrument cluster they were almost as dim as the warm glow normal lights. I took them back out and powered both a normal light and the LED light simultaneously with the same supply. I couldn't believe how bright the normal lights actually were. Which makes me ask myself - "What's up here?" It's too late and rainy to do any more investigating tonight. But does anyone know if there is a filter or light limiting apperature and maybe a diffuser between the bulb and the light outlet port at the top of the cluster? I don't believe there is any reason other than that to account for how dim these bulbs seem to be. I will also post the photos of the final product. I'm kinda
> proud of them. Look in the photo section in folder called
>
> "bogy's LED intrument cluster lights"
>
> Bogy
>
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