I often find myself wanting to adjust the brightness of my emissive materials. Also, I would like to be able to not directly see the emissive material, but would like the see the glow and reflections.
There is a slider under the Atmosphere tab in the Visual settings dialogue named Artificial Light Brightness. This might do what you were asking.
However I do agree that some sort of keypress/toggle/button that would let you scroll this slider while within the Enscape window would be useful. Similarly if this setting* could be saved per scene/view it would be cool.
(* along with 99% of the other Visual settings)
Thank you both, I'm forwarding your feedback as usual. And as mentioned by Gadget , if you want to control the overall Artificial Light Brightness of all emissive surfaces and lights, you can use the slider accordingly.