I found this on FB Marketplace, anyone know what kind of phosphor this uses? My guess would be Halo.

March 2003 phosphor? 

In all seriousness, probably Halophosphate. But, the best way to find out is to light it up.

I would guess that they are a blend including some triphosphor. These are basically a F40T12/741 and I've seen them labeled as "Cool White Plus" "Contractor's CW" and "Home Light Cool" I assume they labeled them differently depending on where and how they were sold (small hardware stores in 2 or 10 packs, versus electric supply stores in cases of 30.)

I bought them. They appear to be pure triphosphoric tubes. Usually the ones with a mix of tri / halo will glow green under a UV lamp.

You really gotta look at those with a spectroscope, even just a diy one made from a toilet roll and a cd/dvd.
 
I associate a green glow more with the type of phosphor in >90 CRI fluorescents based on triphosphor stuff. Normal halophosphate mixtures do not or only barely glow under UVA light.