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IES TM-24-20

Technical Memorandum: An Optional Method for Adjusting the Recommended Illuminance for Visually Demanding Tasks within IES Illuminance Categories P through Y Based on Light Source Spectrum

standard by Illuminating Engineering Society, 05/28/2020

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Full Description

This document addresses how the spectral power distribution (SPD) of light sources can be incorporated into the IES Illuminance Determination System for visual tasks that are categorized as P through Y within interior lighting applications. It describes how a light source's SPD affects pupil size, visual acuity, and visual efficiency under interior lighting conditions, and establishes an optional calculation method, Equivalent Visual Efficiency (EVE), for adjusting IES recommenced illuminance targets under limited circumstances when visual tasks require the ability to discern achromatic visual detail to ensure speed and/or accuracy in the performance of the visual task. This Technical Memorandum documents the fundamentals of visual efficiency, defines the EVE calculation method, and addresses practical concerns for implementation.
 

Product Details

Published:
05/28/2020
ISBN(s):
9780879953911
Number of Pages:
31
File Size:
1 file , 1.4 MB
Note:
This product is unavailable in Ukraine, Russia, Belarus
 

Document History

  1. IES TM-24-20

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    Technical Memorandum: An Optional Method for Adjusting the Recommended Illuminance for Visually Demanding Tasks within IES Illuminance Categories P through Y Based on Light Source Spectrum

    • Most Recent

  2. IES TM-24-13


    An Optional Method for Adjusting the Recommended Illuminance for Visually Demanding Tasks Within IES Illuminance Categories P through Y Based on Light Source Spectrum

    • Historical Version