The option of a wall with white marble texture and LED strips 3000×3000 mm Who works in the V-Ray version lower than 3.1 be careful in the materials in the BRDF section there is a 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 to you.