This 36-watt round pendant light is used for lighting shopping centers, offices, galleries, and common areas of business-class residential buildings and above. The unique diffuser shape with lenses resembles a piece of jewelry.
The medium beam width is suitable for comfortable spotlighting and accent lighting. Uniform, flicker-free illumination, excellent color rendering, and TRIAC brightness control provide high-quality interior lighting.

Dimensions: Ø650×34 mm
Bowl dimensions: Ø65×26 mm
Suspension length: 1200 mm
Color temperature: 3000, 4000 K
Luminous flux: 2900, 3160 lm
Beam angle: 45°
Color rendering index: CRI>90
Protection level: IP20
Power consumption: 36 W
Power supply voltage: 230 V
Body color: black, white

https://arlight.ru/search/?q=SP-DIAMOND-R650-36W 

"If you're using a V-Ray version earlier than 3.1, please note that the BRDF section in the materials lists Microfaset GTR (GGX). If your version is older than 3.1, the BRDF field will be empty. Select Blinn, Phong, or Ward—whichever is more preferable."