Other models from the same series:

Table lamp
https://3dsky.org/3dmodels/show/nastolnaia_lampa_lyfa_mosaik_table_lamp 

Pendant lights 2
https://3dsky.org/3dmodels/show/podvesnye_svetilniki_lyfa_mosaik_pendant_sidebyside_2 

Hanging lamp
https://3dsky.org/3dmodels/show/podvesnoi_svetilnik_lyfa_mosaik_pendant 

Dimensions:
height 36.2 cm
width 79.1 cm
depth 25 cm

There are 2 copies of the model saved in the scene, each with its own adjusted material, two colors - black and white.

On the model in the scene, the Turbosmooth modifier is assigned in the Render Iterations = 2 mode, which is applied only during rendering.
In the obj file, the model is saved with the applied Turbosmooth.

All objects have normal names.
All materials have convenient names.

Model weight without Turbosmooth:
4970 polygons
5152 vertices

Made according to the photographs and dimensions of the manufacturer
https://www.finnishdesignshop.com/lighting-ceiling-lamps-pendant-lamps-mosaik-pendant-sidebyside-black-p-37431.html 
https://www.finnishdesignshop.com/lighting-ceiling-lamps-pendant-lamps-mosaik-pendant-sidebyside-white-p-37449.html 

Who works in V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfaset GTR (GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - which 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 adjusted taking into account PBR.