General V(λ) mismatch index: History, current state and new ideas
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A photometer is an instrument for measure photometric quantities, such as illuminance or luminous flux.
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Your answer should fit the spectral luminous efficiency, V(λ).
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The general mismatch index V(λ) quantifies the lack of fit.
The general index of mismatch of V(λ), denoted as f1‘, is used to measure the mismatch between what a photometer measures and the human visual response to daylight levels.
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As we explained in this previous article, photometers are used to assess the quantity of light emitted by a light source, and are used, for example, to assess the lighting capacity of any light source, from the most traditional to the most recent products based on LED technology.
The presented article delves into the historical development of the general mismatch index V(λ) and provides information on its current definition and justification. It presents possible adjustments to improve its applicability in the future.
In particular, it is expected that photometer calibration will shift to modern white light-emitting diode (LED) light sources. And accordingly, the article explores alternative normalizations on f1‘ to account for the relative spectral responsiveness of the photometer with respect to the actual calibration light source, such as SC< /sub>(λ), instead of the traditional standard illuminant A (SA(λ)).
In addition, the increasing importance of measuring colored LEDs requires consideration of whether a single general mismatch index for white and colored light sources is sufficient. The article proposes innovative ideas for the future development of a new index specifically designed to assess light meter mismatch under lighting conditions involving colored LED sources.
This is a scientific article done in collaboration with Techno Team from Germany, the CSIC Institute of Optics, the Technical University of Denmark, the Aalto University Metrology Research Institute< /a> and the German National Metrology Institute
IO-CSIC communication
cultura.io@io.cfmac.csic.es
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