Ray ceiling lamp from Schoolhouse
The models are made according to size and photos from the official website:
https://schoolhouse.com/products/ray-17 

The scene contains 2 copies of the model (17 and 8 inches), as well as 7 spheres, each with its own customized material.
The models have a Turbosmooth modifier with Render Iterations=3 enabled, which is applied only during rendering.

The models are saved in the obj file using Turbosmooth with 3 iterations.

Dimensions and number of polygons/vertexes of the 17-inch lamp:
width: 17 in (43 cm)
Depth: 17 in (43 cm)
Height: 5.5in (14 cm)

1944 polygons
1965 vertexes

Dimensions and number of polygons/ vertexes of the lamp 8 inches:
width: 8 in (20 cm)
depth: 8 in (20 cm)
Height: 3.9in (10 cm)

1952 polygons
1973 vertexes

All objects in the scene have unique names.
All materials have unique names.
All the cards have unique names.

Those who work in V-Ray versions lower than 3.1 be careful, the materials in the BRDF section contain Microfaset GTR ( GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward, whichever is preferable for you.

For Corona render, it is recommended to install a version not lower than 1.5, since the glossiness of the materials is configured with PBR in mind.