I've been a member here for 6 yeras now and I see lots of people discussing older HPS or MH fixtures believing that they must've been originally MV and were converted to MH or HPS . Not always the case . I've seen several instances of 60's fixtures which were available in MH and HPS also . For example , LM Unistyle 400 & Unistyle 1000 were available from the factory in all 3 flavors . The M-400A was also . Mid 60's Revere catalogs list both MV and "Metallic Additive" versions .
I've seen some of which more are originally HPS than MV , i.e. AEL 25 , LM Unidoors , M-400A .