40 Watt, 48″ T12 Lamps
Light Quality Selection:
D50 – 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##T12/GL50” where the ## is the wattage (14, 20, or 40).
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, automotive, food) markets. Provides compliance with ASTM D1729 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##T12/CM65” where the ## is the wattage (14, 20, or 40).
Cool White Fluorescent (CWF) – A wide band single phosphor fluorescent source commonly used in commercial lighting applications in North America. It is characterized by emitting high amounts of green energy, with a color temperature of approximately 4100K. It has a CRI or approximately 62.
For an explanation of various light sources and their use in visual color matching applications, click here: http://gtilite.com/pdf/Various-Light-Sources.pdf