Approved Method: Photometric Testing of Skylights and Tubular Daylighting Devices under Hemispherical Sky Conditions

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This guide provides the IES required uniform method for determining and reporting the photometric characteristics of skylights and tubular daylighting devices.

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Description

This guide provides the IES required uniform method for determining and reporting the photometric characteristics of skylights and tubular daylighting devices. It describes the procedures followed and the precautions observed in obtaining uniform and reproducible measurements of tubular daylighting devices and skylights with glass or plastic glazing (not recommended for devices with clear glazing). This guide identifies the components and the structure type needed to adequately measure daylighting devices. The procedures, calibration of the equipment, and determination of sun angles and sky conditions are also discussed.

Softcover or Digital PDF: 14 pages
Publisher: Illuminating Engineering Society (2010)
SKU: LM-81-10
ISBN-13: 978-0-87995-242-6
Dimensions: 8½” x 11″

Additional information

Weight 1 lbs
Dimensions 11 x 8.5 x .25 in
Format

Digital, Softcover

Table of Contents

  • Scope and Purpose
  • General Lighting Characteristics
  • Test Distance
  • Goniophotometer Basic Construction
  • Goniophotometer Structure
  • Calibration
  • Sky Conditions
  • Testing Procedures
  • Testing Procedure Steps
  • Limitation of Skylight Photometry
  • Annex A  Accuracy of the Quadrant Testing Method
  • Annex B  The Testing of Transparent Skylights
  • Annex C  Accuracy Analysis of Reflections from Black Card
  • Annex D  Calculation of Standard Tine for Different Solar Elevations
  • References