Would be great if Vray Light Lister added an option next to ‘On’ for ‘isolate’ where by checking that checkbox it turns all the other lights off so you can quickly see what one light is doing, without have to remember which lights you had on/ off. Similar to hdr light studio
Would be very helpful with scenes with many lights!
I’ve added this to our system.
sweet! :o
Just to be clear, “I’ve added this to our system” means that it’s now on our to-do 
It will take some time to get to it, though.
Today’s nightly builds now have this option. We didn’t add another control (there’s already too many of them), but instead added a right-click menu that you can call by right clicking the select-light button (the one to the far most left-hand side).
We don’t have a way to un-solo (un-isolate) the lights for the moment, though, since we need to tweak the code a bit more, but we’ll eventually add an un-solo option too.
Is the un-solo function added to Vray Light Lister?
It might be nice if it worked by alt-clicking like Photoshop does for soloing layers…
When someone solos a light you save the current state of which lights are on and when they alt-click again you revert to the previous state (rather than turning all lights on).
We haven’t gotten to the un-solo part, yet 
But basically yes, we just need to save the states before that (for all lights) to be able to restore it upon un-solo-ing.
Adding the solo option was easy, as we just go through all scene lights and disable all but one. The light lister originally never kept track of what we need for un-solo-ing and we need to build that from scratch. That’s why we haven’t done the un-solo action yet, as there’s more pressing matters to attend to. We’ll get to it eventually.
That would be handy to have.
Why don’t we get this for 3ds Max as well?
Just select all the lamps in the lister, uncheck “enable”, and enable the one you want.