The stretch track STRINGLINE PLUS from Centersvet
is up to 10 m long with a light strip with reflected light from the ceiling.
The track can be cut anywhere with millimeter accuracy.
The track can be mounted at various angles and even on perpendicular walls

STR TRACK + STR LINE + STR LOCUS

Corona version 9
Materials of CoronaLegacyMtl + Vray

CoronaLegacyMtl requires a version of Corona Renderer at least 1.5 since the cards are designed to use PBR (roughness-metallic)

Vray materials are obtained using Vray-converter
Who works in a 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 for you.
All cards are designed for the PBR roughness-metallic workspace.

Textures and materials have logical names
Texturing UnwrapUVW

There are several options for the location of the track in the scene (shown in the secondary previews)

https://www.centersvet.ru/catalog/stringline_system/string_of_light/