I would like to share that I’ve found the documents for many Westinghouse lamp catalogs from the 1970s and 80s, which contain lots of information and specifications on the lamps and coatings that they made. I was most interested in the Lifeguard mercury vapor lamp section, but there are plenty of others including HPS lamps, fluorescent lamps, and incandescent lamps. Obviously not an LED in sight!
I’ll link some here.
Westinghouse Large Lamp Catalog 1980
https://www.scribd.com/document/113723979/Westinghouse-Jan-1980-Large-Lamp-CatalogWestinghouse Large Lamp Catalog 1975, notice it mentions the discontinuation of /C and /W lamps.
https://www.scribd.com/document/112839524/Westinghouse-1975-Large-Lamp-CatalogWestinghouse Fixture and Roadway Lighting Catalog, 1978
https://www.scribd.com/document/382145295/Westinghouse-Lighting-Roadway-Lighting-Product-Brochure-3-78Enjoy! There are also more that you can search for.