The round lamp is built into walls and is used to illuminate steps, walkways, and corridors. Asymmetrical light distribution allows for decorative lighting effects on horizontal surfaces.
The aluminum alloy body of the lamp is reliably protected from dust and moisture. The optical part is covered with shockproof tempered glass, and its special design provides light without a blinding effect.

Dimensions: Ø115×37 mm
Color temperature: 3000K
Light flux: 330 lm
Beam angle: 65°
Color rendering index: CRI>80
Dust and moisture protection level: IP65
Power consumption: 4 W
Power supply: 230 V
Body color: gray

https://arlight.ru/search/?q=LTD-TRAIL-R115-4W 

"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 - what is preferable for you"