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上列價格為CIE國際定價，向CIE-Taiwan訂購可享折扣優惠，CIE-Taiwan會員更享有會員優惠價，歡迎來電03-5732376或e-mail : cie_taiwan@itri.org.tw 洽詢。

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This document was revised by the International Commission on Illumination (CIE) and is now published in cooperation with Technical Committee ISO/TC 274, Light and lighting. This first edition of ISO/CIE 23539 cancels and replaces ISO 23539:2005/CIE S 010:2004, which has been technically revised.
The main changes are as follows:

•  The scope of the document has changed to incorporate the spectral luminous efficiency functions published by the CIE for a) mesopic vision and b) 10° photopic vision, on the basis of CIE 018:2019.
•  The International System of Units (SI) and its reformulation of the definition of the candela – effective on 20 May 2019 – has been incorporated (Resolution 1, 26th CGPM, 2018).
•  A list of normative references has been added.
• Specific requirements have been added regarding the use of units, tabulated values and interpolation of intermediate values.
•  The background of the CIE system of physical photometry, specifically the evolution of the photometric base unit, has been updated in Annex C.
•  The CIE 2015 cone-fundamental-based spectral luminous efficiency functions for a) 2° field size and b) 10° field size have been added in Annex E based on CIE 170-2:2015.

The purpose of photometry is to measure light as perceived by human eyes. The brightness of a luminous surface depends not only on the amount of radiation it emits, transmits or reflects, but also on its spectral composition and on the visual response function of the observer viewing it. Because human visual response varies at different light levels and from person to person, precise photometry requires the definition of representative standard observers. The CIE system of physical photometry specifies procedures for the quantitative evaluation of optical radiation in terms of internationally agreed spectral luminous efficiency functions for human vision. V(λ) represents photopic vision, V'(λ) represents scotopic vision and Vmes;m(λ) represents mesopic vision, the latter being intermediate between photopic and scotopic vision. Furthermore, V10(λ) represents 10° photopic vision. These luminous efficiency functions adopted from CIE 018:2019 and BIPM-2019/05, together with the SI base unit, the candela, constitute a system that enables the calculation of values of photometric quantities for optical radiation as well as light-emitting, light-transmitting or light-reflecting surfaces, to be precisely determined based on the International System of Units (SI), regardless of the spectral composition of the radiation emitted, transmitted or reflected.

The CIE system of physical photometry has some limitations in respect to the brightness of coloured surfaces: two light sources of different colour but with the same measured luminance value will not necessarily be perceived as equally bright. CIE has therefore published a more complex model (CIE 200:2011) for specific situations. For eye-mediated non-image-forming effects of light induced partially or completely by the intrinsically photosensitive retinal ganglion cells (ipRGCs), CIE S 026/E:2018 is used.

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Published:2023

Number of Pages:52

File Size:1 file , 2.1 MB

Note:This product is unavailable in Ukraine, Russia, Belarus 

上列價格為CIE國際定價，向CIE-Taiwan訂購可享折扣優惠，CIE-Taiwan會員更享有會員優惠價，歡迎來電03-5732376或e-mail : cie_taiwan@itri.org.tw 洽詢。

Full Description

This document was revised by the International Commission on Illumination (CIE) and is now published in cooperation with Technical Committee ISO/TC 274, Light and lighting, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 139, Paints and varnishes, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This first edition cancels and replaces ISO 11664-2:2007/CIE S 014-2:2006, which has been technically revised. CIE illuminant D50 has been included as CIE standard illuminant due to its extensive use in the fields of graphic, arts and photography and the references have been updated.
In addition to CIE standard illuminant A and D65, this document also defines CIE illuminant D50 as a new standard illuminant.
a) CIE standard illuminant A
CIE standard illuminant A is intended to represent typical tungsten-filament lighting. Its relative spectral power distribution is that of a Planckian radiator at a temperature of approximately 2 856 K. CIE standard illuminant A should be used in all applications of colorimetry involving the use of incandescent lighting, unless there are specific reasons for using a different illuminant. CIE standard illuminant A is used in photometry as primary reference spectrum for the calibration of photometric devices.
b) CIE standard illuminant D65
CIE standard illuminant D65 is intended to represent average daylight having a correlated colour temperature of approximately 6 500 K. CIE standard illuminant D65 should be used in all colorimetric calculations requiring representative outdoor daylight, unless there are specific reasons for using a different spectral power distribution. Variations in the relative spectral power distribution of daylight are known to occur, particularly in the ultraviolet spectral region, as a function of season, time of day, and geographic location. However, CIE standard illuminant D65 is used pending the availability of additional information on these variations.
c) CIE standard illuminant D50
CIE standard illuminant D50 is intended to represent daylight with a correlated colour temperature of approximately 5 000 K. CIE standard illuminant D50 should be used in colorimetric calculations where the use of such a correlated colour temperature is intended.
Values for the relative spectral power distribution of CIE standard illuminants A, D65 and D50 are given in this document at 1 nm intervals from 300 nm to 830 nm.

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Published:09/01/2022

Number of Pages:24

File Size:1 file , 1.2 MB

Note:This product is unavailable in Russia, Ukraine, Belarus