Mysterious light

[lagerCSN]

As shown in the title, when the blue light or purple light is turned on in the passenger compartment of A300, the cabin has color light, but we can't see where it comes from

 

In other words, the color of the lights on the roof has not changed, but there are colored lights in the cabin of the aircraft

...:

 

[Max]

This is as intended.

It is ambient lighting, which you can change the intensity of on the panel in the cabin.

Cheers.