GTI is a leading manufacturer of tight-tolerance D50 lighting systems for color viewing. An in-house spectroradiometric laboratory and 100 percent measurement and verification production process guarantees that precision and accuracy is built into all products. The Graphiclite D50 daylight products include desktop systems, pressroom viewing stations, large-format viewing systems and soft-proofing systems. All products (LED and fluorescent) comply with ISO 3664:2009, the international standard for viewing in graphic technology and photographic conditions.