FREELIGHT R is a flexible neon lamp that can take on any shape. You can combine lamps with each other and create unique light compositions and art objects from Centrsvet
https://www.centrsvet.ru/catalog/freelight_main/freelight_r/ 

The scene contains finished tubes 1200 1400 1600 and 2000 mm long as well as several ready-made compositions from them.
Tube diameter 25 mm
To create holes in the ceiling use the auxiliary cylinders by adding them Corona distance for the ceiling material
Neon tubes are not editable – converted to editaible poly

For Corona render it is recommended to install a version of at least 1.5 since the glossiness of materials is configured taking into account PBR

Those who work in V-Ray versions 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 – whichever suits you best