I found an Osram fluorescent lamp at the thrift shop. Color 15 is supposed to be just 'daylight'.

However, this lamp is stamped with 'daylight deluxe'. If i browse the pre-1970 catalogs, color 15 refers to daylight. The 1970 catalog calls color number 15 'Daylight deluxe'.

So what is this exactly? Is this a normal ~75 CRI daylight lamp, or is it more special?