Lighting Problems from Upgrade Vray 1.5/Rhino 4.0 to Vray 3.4/Rhino 5.0

[john_douglas_architects]

I upgraded Vray and Rhino from 1.5 and 4.0 respectively this morning and I have been on forums and tutorials all day working through the lighting changes between versions. I didnt expect to have so many issues with the upgrade, but here I am. I think I have finally figured out the sunlight (still a bit bright--suggestions welcome) but I am stuck on getting my interior lights to look the way they did in the previous version. I have cycled through values of 1-1500 for intensity and have used lumens, watts, and scalar values. The interior rendered very well and bright in vray 1.5 so I am not sure where my issue lies. I even hid my "old" lights and created some new lights within 5.0 with no luck.
Maybe someone can share their settings? I've also been through camera settings, GI settings, and environment settings (and have also went back to the default settings multiple times). When I increase the intensity of the lights everything just gets more washed out rather than appearing softer or brighter.

I attached two images to show the differences and maybe someone can offer some advice. These are the light settings for each:

Vray 1.5 / Rhino 4.0
Can Lights (Rectangular): 40 W
Cove Lights (Rectangular): 60 W


Vray 3.4 / Rhino 5.0
Can Lights (Rectangular): 40 W
Cove Lights (Rectangular): 60 W
--All are "no light" (I have also tried simple portal light), invisible, and affecting diffuse, specular and reflections.

[fpedrogo]

We made several changes in V-Ray 3.4 for Rhino in order to make it easier to use and also to be constant with the rest of the V-Ray product. V-Ray 3.4 automatically run an update script to convert your V2 scene to V3.4, but you may still having some difference between them. Some of the changes are related to the gamma and also to the potometric scale of the render. This will produce a darker render if you compare it with V-Ray 2.0. We also removed the color mapping and set the render to be linear all the time without any burn value. You will have to use the VFB Highlight burn to remove the over bright areas. For more info about migration between V-Ray 2.0 and V-Ray 3.4 please, look at this page: https://docs.chaosgroup.com/display/...vious+Versions

Best

[john_douglas_architects]

I did not upgrade from 2.0 as I stated in my post. I upgraded from 1.5 which is even earlier.. so these automatic update scripts might not have worked? Going back and forth from my previous v ray settings to 3.4, there are a lot of differences in parameters that I can check and uncheck but they dont all match up. It seems like 3.4 has a lot more features which is great, but I'm really in need of getting this model to work ASAP. The link you sent discusses differences between 2.0 and 3.4.. if there is a way for you to attach a render setting that I can load into my vray, that'd be great.

I am also noticing that my materials are coming in a bit darker too when previewed in the material editor. I have been looking into the "linear workflow" check box and its relationship to gamma (but this appears to only be a thing in vray for 3D studio max). Could you explain this? For example, I have a orange vinyl material and when it previews it shows up as red. When I uncheck the linear workflow, it turns orange. Should I uncheck all of these for my materials? Maybe this will lighten my scene?