D65 is the color temperature code for 6500 K and corresponds to average daylight from the northern sky. Many international standards use this value as a reference for color matching. In a European standard DIN 5033-1 (Colorimetry - Part 1: Basic terms of Colorimetry), the spectral energy distribution between 300 and 780 nm is defined in increments of 5 nm.
Today, a D65 lamp designed to simulate daylight must comply with the ISO 3668 standard (Paints and varnishes – Visual comparison of paint colour). This standard includes all the parameters required to ensure colour comparisons that meet the standard, such as display and ambient conditions. The illuminance level defined in this standard is between 1000 and 4000 lux.
In the D15 1343 standard, developed by the PSA Peugeot Citroen group, Europe's second largest automobile manufacturer, a test method is defined for the visual comparison of material colors used in the automotive industry in a light room. The light room design used must comply with the standards described above. Display cabinets and lighting fixtures, which are generally used in laboratories, provide 2000 lux illumination as standard with optional brightness controls.
Colors in nature offer a striking dimension of diversity, but understanding its function largely depends on the ability to capture one's perspective. Colorimetry is a device that includes methods for measuring and identifying color differences. Because the experience of color is largely subjective and similar experiences occur with quite different physical groups, many different instruments and criteria are used. One of the two basic approaches in this regard involves the visual comparison of colors, and the other uses the tools and techniques of photometry and spectroscopy.
Visual color comparison is a technique used to determine which colors are accurate and which are less accurate. Direct visual color comparison is important for evaluating colors and achieving more accurate color rendering performance.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides visual comparison test services of colored material colors in the light room within the scope of D15 1343 standard, with its trained and expert staff and advanced technological equipment.
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