User manual KONICA MINOLTA CL-200A BROCHURE

[. . . ] The transferred data can then be managed freely within Excel®. Includes LED ranking function Color variations, the top topic in the LED industry, can be quantified and a ranking function is also provided. JIS correlated color temperature Correlated color temperature is determined using the equations defined by JIS (Japanese Industrial Standards). Multi-point measurement and user calibration also possible Multi-point measurement management using up to 30 receptor heads is possible. User calibration function enables compensation of measurement values to match a desired standard. [. . . ] Since the color of the emitted light is determined by the temperature of the blackbody, the color of the light emitted by the blackbody can be expressed as the absolute temperature of the blackbody (in Kelvin). This color notation scale is called "color temperature". For example, a 7000K color would be the color of the light emitted by a blackbody heated to 7000K. Figure 1 shows the color of light emitted by a blackbody at various temperatures plotted on an xy chromaticity diagram. This curve is called the "blackbody locus"; "color temperature" expresses a color on this blackbody locus. Correlated color temperature Since the color of white light emitted by illumination equipment and displays is generally close to the blackbody locus, the color of such light sources is normally expressed using "color temperature". However, the color of such light sources is not directly on the blackbody locus. Because of this, a way to enable similar color expression for colors within a larger region close to the blackbody locus was devised. This is called "correlated color temperature", and the larger region is shown by the isotherms on the xy chromaticity diagram in Figure 2. To accurately express the correlated color temperature of a light-source color, it is necessary to state not only the correlated color temperature but the difference from the blackbody locus, normally in terms of uv. *Blackbody An ideal radiator. A body which completely absorbs all incident electromagnetic radiation. Although a perfect blackbody does not actually exist, coal is a familiar object that acts similarly. Figure 1: Blackbody locus on xy chromaticity diagram Figure 2: Closeup of blackbody locus on xy chromaticity diagram showing correlated color temperature region General Reference Information Measurements in the LED manufacturing process When made from blue LED and phosphor The blue light emitted by the LED mixes with the yellow light emitted by the phosphor to create white light. Colors mix to create white light! Blue light emitted by LED element Yellow light emitted by phosphor Package Electrode LED element Phosphor Problem: Since the spectral emission distribution of the blue light emitted by the LED varies for each unit, variations in the resulting white light will occur. Since usually LED lamps use several LEDs, control of color mixing is necessary. General solution: Measure the spectral emission characteristics of each LED element and rank them accordingly. [. . . ] SE Sales Division Beijing Branch Guangzhou Branch Chongqing Office Qingdao Office Konica Minolta Sensing Singapore Pte Ltd. Seoul Office KONICA MINOLTA SENSING, INC. [. . . ]