Spectral Power
Standardized light profiles allow colorists to predict how a fabric will appear under specific retail lighting conditions. The illuminant f11 represents a narrow band fluorescent source commonly found in department stores and offices across Europe and Asia. It is a mathematical table of light intensity across the visible spectrum rather than a physical lamp.
Color Metamerism
Fabrics that match under daylight may look completely different when viewed under illuminant f11. This effect occurs because the fluorescent light has spikes in certain wavelengths that react differently with the dyes in the fiber. Checking for this shift is a requirement for most global apparel brands.
Store Simulation
Buyers use this illuminant to ensure that garments look consistent when they are displayed on the sales floor. If a jacket and its lining match in the lab but clash under illuminant f11, the product will be rejected. Software simulations allow the mill to check this match during the recipe formulation stage.
The use of a standard illuminant ensures that the dyer and the buyer are looking at the same data.
Mathematical Profile
Computer algorithms apply the spectral values of the light to the reflectance data of the fabric. The result is a set of coordinates that define the color in that specific lighting environment.
