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IES LM-72-20

Approved Method: Directional Positioning of Photometric Data

standard by Illuminating Engineering Society , 04/21/2020

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Full Description

This document is intended to provide a clearly defined set of terms to be used to designate the angular positioning of photometric data. The terms are intended to be used by both providers and users of lighting software so as to unambiguously and consistently specify how photometric data is to be "rotated" before it is used. Two similar but fundamentally irreconcilable types of positioning have existed for years. The "Clockwise from North" ("CN") system starts by rotating luminaire photometric data clockwise from north. The "Counter-Clockwise from East" ("CCE") system starts by rotating luminaire photometric data counter-clockwise from east. A third positioning method, called "aiming luminaire at a point," has also existed for years and is also discussed in this document.
 

Product Details

Published:
04/21/2020
ISBN(s):
9780879952150
ANSI:
ANSI Approved
Number of Pages:
23
File Size:
1 file , 2.2 MB
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This product is unavailable in Ukraine, Russia, Belarus
 

Document History

  1. IES LM-72-20

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    Approved Method: Directional Positioning of Photometric Data

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  2. IES LM-72-03 (R2010)


    Directional Positioning of Photometric Data

    • Historical Version