Corona version 9
The model uses materials that may not be displayed correctly in very old versions of the engine.

(!) The model has helpers - You can change the proportions and position of the neon tube, adapting them to your space!
Video instructions:https://vimeo.com/816913820 
In the scene there is also a version of the lamp, translated into editable poly
The export file contains only the non-editable version!
Freelight PDNT is a flexible neon lamp that can take any shape from Centrsvet. https://www.centersvet.ru/catalog/freelight_main/freelight_ring_pdnt/ 

The scene features two original compositions that can be used both separately and together in a common composition
Tube diameter 25 mm

Objects are partially attached, textures and materials have logical names
Texturing UnwrapUVW

For Corona render, it is recommended to install a version not lower than 1.5, since the glossiness of materials is configured with PBR in mind.

Who works in a V-Ray version lower than 3.1 be careful, there is a Microfaset GTR ( GGX) in the materials in the BRDF section, 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