GENERAL V(λ) MISMATCH INDEX - HISTORY, CURRENT STATE, NEW IDEAS

U. Krüger; Alejandro Ferrero; Anders Thorseth; V. Mantela; A. Sperling

doi:10.25039/x48.2021.wp03

GENERAL V(λ) MISMATCH INDEX - HISTORY, CURRENT STATE, NEW IDEAS

U. Krüger, Alejandro Ferrero, Anders Thorseth, V. Mantela, A. Sperling

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

Abstract

The general V(λ) mismatch index, f_1^' quantifies the mismatch between the spectral responsivity of a photometer, s(λ), and the spectral luminous efficiency function, V(λ). A short review of its historical development is given to explain the reasons for the current definition and which adjustments may be useful for the future. The properties of the current definition are described in detail. It is very likely that in the future, calibration of photometers will be done with a white LED light source as reference. It might involve the need for a more adequate definition of the general V(λ) mismatch index, either by using a different normalization in f_1^' for the spectral responsivity of the photometer or by introducing a different type of function for assessing the mismatch. On the other hand, the measurement of coloured LEDs is also becoming increasingly important. Is a single quality index for white and coloured light sources sufficient?

Original language	English
Title of host publication	Proceedings of the Conference CIE 2021
Number of pages	10
Publisher	CIE Commision Internationale de L'eclairage
Publication date	2021
Article number	CIE X048-WP03
DOIs	https://doi.org/10.25039/x48.2021.wp03
Publication status	Published - 2021
Event	CIE 2021 Midterm Meeting & Conference: Light for Life - Living with Light - Online event, Kuala Lumpur, Malaysia Duration: 27 Sept 2021 → 29 Sept 2021 https://malaysia2021.cie.co.at/

Conference

Conference	CIE 2021 Midterm Meeting & Conference
Location	Online event
Country/Territory	Malaysia
City	Kuala Lumpur
Period	27/09/2021 → 29/09/2021
Internet address	https://malaysia2021.cie.co.at/

Keywords

Photometry
Spectral Mismatch
Quality Index
f1Prime (𝑓1′)

Access to Document

10.25039/x48.2021.wp03

OpenUrl availability

Full text

RevStdLED: EMPIR 19NRM02, RevStdLED, Revision and extension of standards for test methods for LED lamps, luminaires and modules
Thorseth, A., Dam-Hansen, C. & Corell, D. D.
01/06/2020 → 01/06/2023
Project: Research

2 Membership of commitees, commissions, boards, councils, associations, organisations, or similar

International Commission on Illumination (External organisation)
Anders Thorseth (Member)
19 Apr 2021
Activity: Membership › Membership of commitees, commissions, boards, councils, associations, organisations, or similar
International Commission on Illumination (External organisation)
Anders Thorseth (Chairman)
21 Apr 2021 → …
Activity: Membership › Membership of commitees, commissions, boards, councils, associations, organisations, or similar

Cite this

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title = "GENERAL V(λ) MISMATCH INDEX - HISTORY, CURRENT STATE, NEW IDEAS",

abstract = "The general V(λ) mismatch index, f_1^' quantifies the mismatch between the spectral responsivity of a photometer, s(λ), and the spectral luminous efficiency function, V(λ). A short review of its historical development is given to explain the reasons for the current definition and which adjustments may be useful for the future. The properties of the current definition are described in detail. It is very likely that in the future, calibration of photometers will be done with a white LED light source as reference. It might involve the need for a more adequate definition of the general V(λ) mismatch index, either by using a different normalization in f_1^' for the spectral responsivity of the photometer or by introducing a different type of function for assessing the mismatch. On the other hand, the measurement of coloured LEDs is also becoming increasingly important. Is a single quality index for white and coloured light sources sufficient?",

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booktitle = "Proceedings of the Conference CIE 2021",

publisher = "CIE Commision Internationale de L'eclairage ",

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AU - Mantela, V.

AU - Sperling, A.

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AB - The general V(λ) mismatch index, f_1^' quantifies the mismatch between the spectral responsivity of a photometer, s(λ), and the spectral luminous efficiency function, V(λ). A short review of its historical development is given to explain the reasons for the current definition and which adjustments may be useful for the future. The properties of the current definition are described in detail. It is very likely that in the future, calibration of photometers will be done with a white LED light source as reference. It might involve the need for a more adequate definition of the general V(λ) mismatch index, either by using a different normalization in f_1^' for the spectral responsivity of the photometer or by introducing a different type of function for assessing the mismatch. On the other hand, the measurement of coloured LEDs is also becoming increasingly important. Is a single quality index for white and coloured light sources sufficient?

KW - Photometry

KW - Spectral Mismatch

KW - Quality Index

KW - f1Prime (𝑓1′)

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DO - 10.25039/x48.2021.wp03

M3 - Article in proceedings

BT - Proceedings of the Conference CIE 2021

PB - CIE Commision Internationale de L'eclairage

T2 - CIE 2021 Midterm Meeting & Conference

Y2 - 27 September 2021 through 29 September 2021

ER -

GENERAL V(λ) MISMATCH INDEX - HISTORY, CURRENT STATE, NEW IDEAS

Abstract

Conference

Keywords

Access to Document

OpenUrl availability

Fingerprint

Projects

RevStdLED: EMPIR 19NRM02, RevStdLED, Revision and extension of standards for test methods for LED lamps, luminaires and modules

Activities

International Commission on Illumination (External organisation)

International Commission on Illumination (External organisation)

Cite this