1200mm

V-Ray versions are 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"

For Corona render, it is recommended to install a version of at least 1.5, since the glossiness of materials is configured with PBR in mind.

link:
https://www.aliexpress.us/item/3256807831547897.html?spm=a2g0o.imagesearchproductlist.main.2.c33cCyBjCyBjo9&algo_pvid=bd5535f0-ad38-4efc-a172-b6632f8898f5&algo_exp_id=bd5535f0-ad38-4efc-a172-b6632f8898f5&pdp_ext_f=%7B%22order%22%3A%226%22%2C%22fromPage%22%3A%22search%22%7D&pdp_npi=6%40dis%21USD%21294.98%21141.59%21%21%212092.03%211004.17%21%40216661c117609677490944547e8a30%2112000043266138812%21sea%21US%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3A8efa5e6%3Bm03_new_user%3A-29895&curPageLogUid=liwJceKa0T4j&utparam-url=scene%3Aimage_search%7Cquery_from%3Apc_web_image_search%7Cx_object_id%3A1005008017862649%7C_p_origin_prod%3A&gatewayAdapt=4itemAdapt