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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...
All Things Lighting® Association Annual Review – 2020
Ian Ashdown, P. Eng., FIES, Senior Scientist CONTENTS HORTICULTURAL Defining Photosynthetic Photon Efficacy HEALTH Ultraviolet Radiation Terminology Spherical Irradiance and Aerosols Designing an Ultraviolet-C Disinfection System Ultraviolet Disinfection for...
All Things Lighting® Association Annual Review – 2018
Ian Ashdown, P. Eng., FIES, Senior Scientist CONTENTS GENERAL Rethinking the Photometric Data File Format HORTICULTURAL Far-Red Lighting and Phytochromes Light Transmittance through Greenhouse Glazing HEALTH The Science of Near-Infrared Lighting: Fact or Fiction?...
All Things Lighting® Association Annual Review – 2017
Ian Ashdown, P. Eng., FIES, Senior Scientist CONTENTS ARCHITECTURAL Blue Light Hazards and Television HORTICULTURAL Horticultural Lighting Metrics GENERAL Rethinking the Photometric Data File Format DAYLIGHTING Cerise365 and DAYSIM Read the full annual report...