Hi maru, here my understanding of the problem.
A. They are assuming that what they see when they render a Photometric Light (IES) in Corona is correct.
B. They want to match the same result with a Corona Light (IES), but in order to do that, they have to reduce the intensity multiplier by a lot (see the image in the
first post).
To further sum this up, the problems are two:
1. There is no consistency between Photometric Light (IES) and Corona Light (IES).
2. What is the correct result between the two?
Regarding point
1, I think there is a different interpretation of the numeric intensity values.
If that is the case, a simple solution would be scaling one of the two, like VRay does when you check "Use 3ds Max photometric scale".
Regarding point
2, I think the correct result is with Corona Light (IES) with proper intensity values.
I have attached a test I made a while ago.
On the left there is a real world reference (2 cheap light sources).
On the right a simulated environment with 2 Corona Light that have correct light intensity and position in space relative to the subject.
The settings and exposure of the virtual camera also match the real camera.
« Last Edit: 2016-10-20, 15:07:44 by karnak »
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Corona Academy (May 2017)