I was looking at some old Westy catalogs on Lamptech today and was a bit surprised by all of the different versions of white they listed ! Along with the "normal" Cool White , Warm White and Daylight colors , they also list Living White , Merchandising White , Sign White and Supermarket White .  Anyone ever seen or heard of any of these

I have heard of those before. I think some might just be brand names for the same colors that other manufacturers offer.

Sign white is probably 6500K. May be with a special phosphor borrowed from backlight sign tubes having peaky spectrum at red, green and blue, to make sign colors more saturated. Or may be it was just 6500K halo sold under fancy name...

Sign White
Merchandising White

Supermarket White
F40T12
F96T12
F96T12 versions lit up

The only one I have not seen or heard of is Living White.

Sign white is probably 6500K. May be with a special phosphor borrowed from backlight sign tubes having peaky spectrum at red, green and blue, to make sign colors more saturated. Or may be it was just 6500K halo sold under fancy name...

According to this 1979 Specification Guide for North American Westinghouse fluorescent tubes, I see that they list sign white as having a color temperature of 5300K:

https://www.scribd.com/document/110155293/Westinghouse-Guide-to-Fluorescent-Lamps-Brochure-1979

Additionally, I have read that these tubes have a CRI of 82. Information is found on page 15.

After reading WWHID's link , It appears that most of these colors are very similar to more "common" colors but with a bit better CRI .

 Living White looks to be 4,300k & 93 CRI

One random thing is that Merchandising White and Modern White Deluxe shared the same abbreviation in order codes of /MWX

Ultralume looks like some early kind of tri-phospjor rare-earth lamp judging by its spectrum??

Ultralumes were great. I think they were early triphosphor lamps, so higher lumens than the deluxe halophosphate lamps at the time and similar CRI. There were 3000K, 4100K & 5000K versions. I remember Sylvania had a "Royal White" our local supermarket used in the produce section that was similar to the 3000K UltraLume. GE had a version called Rite White supposedly but I never saw one; I only remember Kitchen & Baths which may have been WWX originally but then became triphosphor 3000K later. Not sure on that.

Strangely, the Westinghouse catalog I have a scan of provides no descriptions of the CRI and CCT of fluorescent lamps but does list the colors in the ordering codes. I found some info on an interchangeability chart for GE lamps though:

Supermarket White was 4500K; Sign White was 5300K (GE had an exact equivalent); I've seen both of these in use a long time ago. Living White was 4300K, high CRI like a CWX (I've never seen one); Econo-White was the equivalent of Lite White; Agro-Lite was a Gro-Lux plant light. Merchandising White was 3450K with high CRI (like a deluxe version of the Natural White). There was also a Bug-A-Way Gold (yellow).