Against the back wall (rear bulkhead of the cockpit, one can find left and right 2 lamps (Doom Lights for the interior lighting of the cockpit .
For example, when entering in the cockpit as it is dark, or when giving a briefing to the other pilot ...

The left-hand lamp has a white half spherical enclosure or shade.

The other ‘Doom’ Light on the right side is located above the ‘jump seat’.

This ‘Doom Lights are difficult or impossible to find in the well-known hardware vendors. Also on Ebay they are a ‘hard to get’-part.

Therefore, I have here and there playing around a while to own one to tinker.

The bouwscenario with images can be found on following link : http://www.flightdeck737.be/pc/electronics-2/doom-light/