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Technical Report: Photobiological Hazard Assessment of Orbital Solar Reflectors
Executive Summary This report details a photobiological hazard assessment of the general concept of Orbital Solar Reflectors (OSRs). A recent proposal, Reflect Orbital’s proposed Earendil-1 satellite is used as an exemplar. The analysis was conducted following IEC...
Intro to Horticultural Lighting
Introduction This article is based on a presentation I had the pleasure of delivering at the recent Canada Light Expo 2025 in Toronto. My aim with the presentation was to offer a brief overview of some key aspects of horticultural lighting and to highlight how it...
Illuminate the Future of Light and Well-Being at Canada Light Expo 2025 in Toronto, ON
FOR IMMEDIATE RELEASE Illuminate the Future of Light and Well-Being at Canada Light Expo 2025 in Toronto, ON November 12 & 13, 2025. On November 13 at 8:15 AM, at the Canada Light Expo, All Things Lighting® Association will host an interactive workshop titled...
Refinements to the Worthing Relationship – A Quantum Version of Wien’s Displacement Law
Refinements to the Worthing Relationship – A Quantum Version of Wien’s Displacement Law Eric Bretschneider, Ph.D. Abstract Wien’s Displacement Law is a simple equation that allows calculation of the peak wavelength for a black body light source as a function of...
Finding the Danger Zone of the Circadian Stimulus Model: A Summary
Author: Alexander Willemsen, Degree of Master of Science of Engineering Based on a paper authored by Eric Bretschneider, Ph.D. The Circadian Stimulus (CS) model is one of the most well-known models for quantifying the circadian impact of lighting. One striking...
Can Designs and Measurements Based on the Circadian Stimulus Model Stand the Test of Time?
Author: Eric Bretschneider, Ph.D INTRODUCTION When considering the potential circadian impact of lighting, lighting designers have a choice between three different models: melanopic equivalent daylight illuminance, or m-EDI [CIE 2018]; equivalent melanopic lux, or...
All Things Lighting® Association Annual Review – 2022
Ian Ashdown, P. Eng., FIES, Senior Scientist CONTENTS HORTICULTURAL Lighting Uniformity in Horticulture A New IES Standard Blooms Lighting Design as a Cross-Disciplinary Science HEALTH Modeling Spherical Irradiance for UV-C Air Disinfection Visible Light...
All Things Lighting® Association Annual Review – 2021
Ian Ashdown, P. Eng., FIES, Senior Scientist CONTENTS GENERAL Defining Far-Ultraviolet ARCHITECTURAL Visual Glare and CIE 117-1995 – NEMA White Paper HORTICULTURAL Horticultural Lighting Design and Déjà Vu The Effect of Near-Infrared Radiation on Plants Specifying...