Quote - The light gains are indeed passed. If you refer to the fact that Lux shows the gain at 1.0 than be aware that that is not indication if the effective gain. The gain shown in the Lux UI is the gainfor the overall light group. Think of it as a multiplier for all the individual ligh gains in that group.

You have to look at the result, with the linear tonemapper, and you will see that changing the gain in Reality cha ges the brightness of a given light.

 

Hope this helps 

 

Aha!! No wonder the render kept getting darker.  Every render, I'd change the light gain in Lux back to what I'd set it at in Reality. Thanks!