Testing various substances for the outline of the map on the back of the installation, the back board is a sheet of MDF painted black:

I bought and tested the two different types of paint, and actually when the bulbs are on they both look very similar, it is only the glow in the dark paint which leaves any kind of marking or history. The light reflective paint does reflect light but not enough for the camera to pick up. - so i am going with the glow in the dark one.

Test with light reflective paint:



Test with light reflective paint (with a white base):



Test with glow in the dark paint (with a white base):





Marking left -
the marking of the outline is only left for a few seconds before it disappears again. I chose orange as i thought it looked great with the bulb light and glow...I find the marking that would be left interesting and am really excited about including them into my film, as well as close up shots of the filaments inside the bulbs.