Each window of my TARDIS has a 100mm deep light box behind it. The plan is to use frosted perspex for the window and then use white LED strip lighting to make the windows light up.
I didn’t take any photos of the boxes today, but the inside of them has been painted in matte white to help with reflecting and diffusing the light.
The police box signs will also light up, so the inside of those areas were also painted white.
The colour in these photos looks weird, but its due to the soot/smoke in the air from the bushfires in Australia.