Corona materials isn't converted from V-ray, It rebuilt from scratch in order to reach better result. Preview in first page got rendered with V-ray engine and preview in third page got rendered with Corona engine.
Rendered with V-ray version 5 and Corona version 5.

File scale & unit are set with a default value:
Display unit scale = Centimeters
System unit scale = Inches

Polygons for each object:
Low poly: 55K
High poly: 440K

Dimension:
X: ~ 40 cm
Y: ~ 40 cm
Z: ~ 107 cm
PBR 4k textures.
All objects in the scene are logically named and have their own material of the same name / Multi Sub-object.
Archive include 3ds max V-ray and Corona file, additionally .OBJ file format.

https://www.ikea.com/gb/en/p/grindfallet-pendant-lamp-black-20502487/ 
We would be glad to hear what do you think about this object so please write down
your opinion.
Hopefully you would like it.