Approved Method: IES Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE)

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ANSI/IES LM-83-23
Document Type: Lighting Measurement and Testing (LM)

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Product Description

This document describes two annual daylight performance metrics, spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE), which provide two useful dimensions for evaluating daylight performance. Both metrics are generated via a similar computerbased simulation methodology that uses a full year of hourly weather data to calculate illuminance values
inside a given architectural space. The sDA metric is distinguished from many others in that it explicitly accounts for the movement of operable shading devices at daylight apertures, which hereafter in this document will be collectively referred to as blinds.

Subscription Service: Secure Access
Publisher: Illuminating Engineering Society (2022)
SKU: ANSI/IES LM-83-23
ISBN: 978-0-87995-442-0

Chapters:

  • 1.0 Introduction, Changes From Previous, Scope, Overview
    2.0 Spatial Daylight Autonomy (sDA)
    3.0 Annual Sunlight Exposure (ASE)
    4.0 Annual Climate-Based Daylight Modeling Methodology

 

Citation Format:
Illuminating Engineering Society. ANSI/IES LM-83-23, Approved Method: IES Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE)