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Creating light falloff with stacked light and varied radius

Lighting

Stacked light example

This simple scene is a simple blockin of an interior scene with two sun lamps shining through a small gap in an otherwise enclosed box.

This setup mimics a sun near dusk lighting an interior with a highly compressed light falloff. The scene has two lights in the same location, but with different radius, different color temperatures and different max bounces.

The technique isn't "photographical realistic" realistic but is commonly deployed by 2d artists.

https://www.youtube.com/watch?v=UnxLy71xuPk

Setup (srgb)

First lamp

This light has a limited bounce to avoid tinting the indirects red. Below is with the default 1024 bounces.
High bounce on the red lamp will tint the shadow red

Second lamp

Setup (filmic)

This is with the same parameters as the srgb set up.
Filmic render

You can still achieve the blown out highlight look with filmic transform but not without some tweaking. Filmic compresses highlight and reduces color saturation, increasing the strength of the sun lamp is a necessity. The scene will be overall more illuminated and less saturated. The color falloff is also less pronounced.

Filmic render adjusted

Example blend file

stacked_lights.blend