Excella fluorescents' ability to render colors accurately is of particular value in such places as printing plants, art galleries, clothing stores, paint stores, and other establishments where color matching is critical. There is no need to take something to the window to check their true color. Under Excella fluorescents you see things almost exactly as you would under natural light. With a color temperature of 5765K and a CRI of 91.1 these lamps come astonishingly close to natural light.