Luminance (CineRender Surface Channel)

Use this channel to add a light-independent, luminescent color to your surface.

A luminescent object can be seen even when there are no lights in the scene. It is self-illuminated.

If you are using an image as your texture, load a file to use as a luminance map. The brighter a pixel in the luminance map, the more luminescent the corresponding region of the surface. If you have chosen a Luminance Color and loaded a texture (luminance map) as well, the color will be added at 100% strength to the texture. If you want to see the result without the chosen color, set Mix Strength to 0%.

Luminescent surfaces are used to help simulate objects that seem to be self-illuminated in the real world, such as the windows of an office block at night, neon writing or a TV screen.

https://helpcenter.graphisoft.com/wp-content/uploads/archicad-24-reference-guide/131_cinerendersurfaces/Luminance.png 

https://helpcenter.graphisoft.com/wp-content/uploads/archicad-24-reference-guide/131_cinerendersurfaces/LuminanceSettings.png 

Color and Brightness

See Defining Color and Brightness Values.

Texture

See Textures (CineRender Surfaces).

Mix Mode/Mix Strength

See Mix Mode and Mix Strength (CineRender Surfaces).