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Letter to the editor

Letter to the editor Dear Editor: I am writing you to inform you of recent developments (I) Endorse the recommendation of the CCPR of Sep- on the international scene regarding nomenclature for bi- tember 1975 that the lumen replace the candela as the base ologically related units such as the lumen and to solicit views photometric unit and define the lumen as follows: on some related matters up for decision during the coming The lumen is the luminous flux that produces a year. human visual response equivalent to that produced by These issues were first opened at the 1975 meeting of the watt of monochromatic radiation of frequency Consultative Committee for Photometry and Radiometry 540.0154 X lo’* Hz (equivalent to 555 nm wave- in Teddington, England. At that meeting the Australian, length). Canadian, and US. delegations submitted a proposal that the photometric units be defined in terms of the watt and Note: For measuring luminous flux, the CIPM endorses agreed-upon values for the V(X) function and K,,,. The the use of the spectral luminous efficiency for photopic vi- CCPR voted its agreement with these proposed changes and sion V(h) previously endorsed by the CIPM and the spectral announced its intention of taking formal http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Color Research & Application Wiley

Letter to the editor

Kessler, Karl. G.
Color Research & Application , Volume 2 (2) – Jun 1, 1977
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Publisher
Wiley
Copyright
"Copyright © 1977 Wiley Subscription Services, Inc., A Wiley Company"
ISSN
0361-2317
eISSN
1520-6378
DOI
10.1002/col.5080020201
Publisher site
See Article on Publisher Site

Abstract

Dear Editor: I am writing you to inform you of recent developments (I) Endorse the recommendation of the CCPR of Sep- on the international scene regarding nomenclature for bi- tember 1975 that the lumen replace the candela as the base ologically related units such as the lumen and to solicit views photometric unit and define the lumen as follows: on some related matters up for decision during the coming The lumen is the luminous flux that produces a year. human visual response equivalent to that produced by These issues were first opened at the 1975 meeting of the watt of monochromatic radiation of frequency Consultative Committee for Photometry and Radiometry 540.0154 X lo’* Hz (equivalent to 555 nm wave- in Teddington, England. At that meeting the Australian, length). Canadian, and US. delegations submitted a proposal that the photometric units be defined in terms of the watt and Note: For measuring luminous flux, the CIPM endorses agreed-upon values for the V(X) function and K,,,. The the use of the spectral luminous efficiency for photopic vi- CCPR voted its agreement with these proposed changes and sion V(h) previously endorsed by the CIPM and the spectral announced its intention of taking formal

Journal

Color Research & Application – Wiley

Published: Jun 1, 1977

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