Negative light and emission in Blender

This is one of the cool secrets. If you want to correct light leakage or light artifacts, or you want to have more control over light and shadow, or you want

shaders - Is there a way to limit the distance travelled by an emission ray? - Blender Stack Exchange

Negative light and emission in Blender : r/blender

Lights with Negative Values in Blender

Negative light and emission in Blender : r/blender

Blender Lighting Compositing For Beginners, Blender Emission Map

Blender Supports Negative Light - Blender Tests - Blender Artists Community

Matthew Lindley - Positive Negative Light

Cycles feedback - User Feedback - Developer Forum

Getting started with fluid simulation + troubleshooting

Why is adding point lights making my render grainy? (Cycles) : r/blenderhelp

Blender Supports Negative Light - Blender Tests - Blender Artists Community

Matthew Lindley - Positive Negative Light

Why use Blender's 'lights' over just a mesh with emission? - Lighting and Rendering - Blender Artists Community

Blender Lighting Compositing For Beginners, Blender Emission Map