D50 – A 5000K A 5000K (Correlated Color Temperature), high CRI (Color Rendering Index) color viewing lamp for Graphic Arts and Photographic color viewing. Provides compliance with ISO 3664:2009 when used in correct lighting system. These lamps are identified as Graphiclite 100 D5000 Color Viewing Lamps with a part number “F##T8/GL50” where the ## is the wattage (11, 15, 17, 25, 32, 40, or 58).

D65 – A 6500K (Correlated Color Temperature), high CRI (Color Rendering Index) color viewing lamp for visual color match assessment in many industrial color (paints, plastics, textiles, food) markets. Provides compliance with ASTM D1729-96(2009) lighting standard when used in correct lighting system. Also applies to SAE J361 and BS-950 Part 2. These lamps are identified as GTI ColorMatcher 6500K Color Viewing Lamps with a part number “F##T8/CM65” where the ## is the wattage (11, 15, 17, 25, 32, or 40).