Working with light groups

[dobe]

it is possible to control the light groups after rendering like in corona?

[B.Y.O.B.]

You can edit them during the render (final or viewport) and while the render is paused.
However, once you stop a final render, you can no longer edit it. This is a Blender limitation.
See this video: https://youtu.be/TgqHZtWeIXk

and is it possible to render the light groups as renderpath for composeting in photoshop?

I don't know what you mean by "renderpath", but you get the light groups as AOVs (passes) in the Blender compositor.
You can use a file output node to save them to individual files so you can load those into Photoshop.
https://docs.blender.org/manual/en/late ... /file.html

[dobe]

thx. that helps me a lot

one more question:
is there a tutorial how to use the lux AOVs in photoshop (overlay mode) to get the final render image?
that would be grat

[B.Y.O.B.]

is there a tutorial how to use the lux AOVs in photoshop (overlay mode) to get the final render image?

No, but it's not much different than in Cycles: https://docs.blender.org/manual/en/late ... #combining
The names are different, but you mostly just add them together.