Specifying Colour Quality Beyond CRI: TM-30 and IEC 62471 for Hospitality and Gallery Lighting For two decades a single number, CRI Ra, decided whether an LED luminaire was "good enough" for a hotel lobby or an exhibition wall. That habit is now the most common cause of expensive lighting complaints: a fixture can score Ra 90 and still render skin tones grey, shift reds visibly, or fail a...