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Using Physically Correct Brightness in Cycles


Johnson Martin writes:

In order to better understand the lighting system in the Cycles render engine, I've decided to dive into understanding how Cycles uses physically based units to accurately measure the intensity of emissive materials. On the surface, the values used by Cycles seem somewhat arbitrary. But digging deeper I've found that once again, Cycles has a facet of accuracy quite underestimated by the common user.

So let's dig in.

About Author

Johnson Martin

I’m Johnson, 3d artist and writer. I’m currently a student, exploring the world of creative arts and a part time 3d Artist at Martin Media. I run Topology Guides, a blog that gives tips and tricks for 3d modelers. l also write for BlenderNation and occasionally, the Sketchfab blog.


  1. Dragon Venom Animation on

    Thank you for the article. It's always nice to get a better understanding of the basis for the wide range of value settings in blender.

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