The X-Rite SpectraLight III is a visual color evaluation system which provides five selectable light sources: • Simulated Daylight (D75, D65, or D50) • Horizon (early morning sunrise/afternoon sunset simulation) • Illuminant “A” (incandescent home lighting) • Cool White Fluorescent (CWF) • Custom Fluorescent (TL84 or U30) • Ultraviolet (UV- used in conjunction with another source)