Understanding Illuminants

Understanding IlluminantsAn illuminant is a mathematical representation of a theoretical light source, used for calculating tristimulus values from a spectrophotometric measurement. The numbers represent relative power of the theoretical source at each point in the visible spectrum. The relative power distribution of a real source could be used for calculation, but real sources are difficult to standardize.

Illuminant A: Mathematical representation of tungsten halogen (incandescent). Color temperature: 2856K. Can be used to test metamerism. Simulates typical home or store accent lighting.

Illuminant C: Mathematical representation of filtered tungsten halogen (daylight). Color Temperature: 6770K. Can be used to test metamerism. Simulates the CIE average daylight.

Illuminant D65: Mathematical representation of average north sky daylight. Color temperature: 6500K. Uses include general evaluation of color, metamerism testing, providing visual correlation with spectrophotometric instrumental readings, and conformance with European and Japanese standards. Simulates average north sky daylight.

Illuminant SPL (D65): Mathematical representation of GretagMacbeth patented Filtered Tungsten Halogen as found in SpectraLight (Daylight). Color temperature: 6500K. Uses include critical evaluation of color, metamerism testing, providing visual correlation with spectrophotometric instrumental readings, conformance with European and Japanese standards, and agreement with the current Automotive standard. Simulates average north sky daylight.

Illuminant D50: Mathematical representation of noon sky daylight. Color temperature: 5000K. Uses include general evaluation of color, metamerism testing, and evaluating color uniformity and quality in the graphic arts industry.

Illuminant F2 (CWF-2): Mathematical representation of commercial, wide band fluorescent used in the USA (Cool White Fluorescent). Color temperature: 4150K. Uses include metamerism testing. Simulates typical office or store lighting in the USA.

Illuminant F7 (DLF-7): Mathematical representation of commercial, wide band fluorescent used in the USA (Deluxe). Color temperature: 6500K. Uses include metamerism testing.

Illuminant F11 (NBF-11): Mathematical representation of commercial, narrow band fluorescent used in the USA. Color temperature: 4000K. Uses include metamerism testing. In USA equivalent to TL84.

Illuminant TL84: Mathematical representation of commercial, rare earth phosphor, narrow band fluorescent used in Europe and the Pacific Rim. Color temperature: 4100K. Can be used to test metamerism. Simulates typical office or store lighting in Europe and the Pacific Rim.

Illuminant F12 (Illuminant U30): Mathematical representation of commercial, rare earth phosphor, narrow band fluorescent. Color temperature: 3000K. Can be used to test metamerism. Simulates typical store lighting for Sears (USA equivalent of TL83).

Illuminant TL83: Mathematical representation of commercial, rare earth phosphor, narrow band fluorescent used in Europe and the Pacific Rim. Color temperature: 3000K. Can be used to test metamerism. Simulates typical office or store lighting in Europe and the Pacific Rim.

Some additional illuminant simulates by the GretagMacbeth`s soft- and hardware:

Illuminant D75: Mathematical representation of north sky daylight. Color temperature: 7500K. Uses include general evaluation of color, metamerism testing, and visual evaluation of opaque materials as outlined by ASTM D1729. Simulates north sky daylight.

Illuminant SPL (D75): Mathematical representation of GretagMacbeth patented, Filtered Tungsten Halogen as found in SpectraLight (Daylight). Color temperature: 7500K. Uses include critical evaluation of color, metamerism testing, and visual evaluation of opaque materials as outlined by ASTM D 1729. Simulates north sky daylight.

Illuminant SPL (HOR): Mathematical representation of Tungsten Halogen as found in SpectraLight (Horizon). Color temperature: 2300K. Uses include metamerism testing. Simulates early morning sunrise or late afternoon sunset.

Illuminant TL85: Mathematical representation of commercial, rare earth phosphor, narrow band fluorescent used in Europe and the Pacific Rim. Color temperature: 5000K Uses include metamerism testing. Simulates typical office or store lighting in Europe and the Pacific Rim.

Questions? Need a Quote? Contact Us.  1.800.248.9748