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Humans and many other creatures perceive light differently than plants. The eye is differently sensitive to visible radiation depending on the wavelength. In daytime or photopic vision, the light sensitivity curve V (ʎ) applies, which has its maximum at 555 nm (yellow-green). All photometric measures, which include lumens, lux and cd / m², take intoRead more
In the fields of interior design and lighting design, precise information regarding the utilized sources of light is required. In particular when being combined with already installed lighting, their parameters have to be measured and matched. The chromaticity of the individual light sources must be measured in order to adjust and balance targeted color effects,Read more
In the field of LED technology, color temperature, color rendering and flicker vary considerably from one manufacturer to the next and distinguish quality goods from bargain products. Already when selecting lamps and light fixtures for the sales program, the manufacturers’ specifications can be rapidly checked and the quality of individual suppliers can be evaluated. ThisRead more
Where shop lighting is concerned, moods are generated by means of contrast, light color and light intensity which arouse emotions and animate us to buy the respective product. In the case of textiles and leather goods, ideal color rendering is important in order to be able to recognize the product’s color and material characteristics. WhereRead more
Additional requirements for color rendering and flicker of the utilized lighting are included in the ASR A3.4 technical rules for workplace lighting, as well as in planning standards DIN EN 12464-1 for indoor workplaces and DIN EN 12464-2 for outdoor workplaces. In particular where LED lighting is used, these values should be checked. Perfect color rendering for exactingRead more
In some areas, increased demands are placed upon color rendering of the lighting used in health care facilities. This applies in particular to examination and treatment areas, operating rooms, intensive care units, laboratories, autopsy rooms and morgues. These are defined in the ASR A3.4 technical rules for workplace lighting, and in planning standard DIN EN 12464-1 for indoorRead more
Color temperature and color rendering were not issues for previous use of conventional lamps, because they were usually fixed depending on the respective system. With the introduction of LED technology which offers extensive degrees of freedom with regard to color temperature and color rendering, it makes good sense to measure these parameters and match themRead more
When developing lamps and luminaires, it’s frequently necessary to have portable measuring instruments at one’s disposal for ballpark measurements in addition to highly accurate measurements in the light lab. And it’s advantageous when the measured values can be saved, transferred to a PC and documented in an individually customizable report using Microsoft Excel. These instrumentsRead more
According to the latest research results, retinal ganglion cells in the eye synchronize the sleeping-waking cycle to the day-night rhythm via hormones. Color temperature and brightness changes which occur during the course of the day play a decisive role in this respect. By matching indoor illumination to the natural daylight progression, or by creating specialRead more
