What is causing this glow?

Please dont mind the colors. I am curious as to what is causing this glow at the bottom of the image. I’m using the Rhino sun. Is there a way to turn it off?

I don’t see a glow, only color gradients.

What would be causing the color gradient from the bright green to the teal?

Short answer - the perspective
Objects closer to the bottom of the image have greater angle between their surface normal vector and the view direction vector. This means that more photons will reflect back to the camera, hence the greater illuminance.

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Thank Nikolay, Is there a way to turn this off so it doesnt create that effect?

This is not an effect, but how the physics works. If you want all surfaces to emit the same amount of photons, you have to render orthographically

Thank you!