Guest Authors

  By Geoffrey Marlow, Founder & President, Marlow Advisory Group Editor’s Note: This article was originally a LinkedIn post by Geoffrey Marlow, reprinted with permission. Special thanks to Geoffrey Marlow.   For years we’ve been told that technology would eventually disintermediate the electrical distributor. Manufacturers would sell direct. Contractors would buy online. Digital marketplaces would [...]

  By Yash Rathod, Design Director, Mario Contract Lighting | VP, IES Roanoke Chapter After designing lighting for almost a decade in the hospitality industry, I walk into a hotel room the way a doctor walks into a waiting room. The first thing that catches my attention is lighting. And even though, it is one [...]

  By Richard Kovac, COO, Golden Lighting The following white paper excerpt is reprinted with permission from Golden Lighting. Abstract: Fixture-scale mistakes are the single most common lighting error in real homes, and they persist because most sizing advice gives homeowners one formula when the problem actually has three variables. This white paper lays out the [...]

  By Yang Lan, International Market Manager, Star Factory Lantern A daytime attraction is read through movement, surface detail and close-range interaction. After dark, silhouette, brightness, color relationships, viewing distance and control strategy take over. Planning both modes together can make outdoor attractions more coherent, serviceable and flexible. At Night, the Design Priority Changes Outdoor [...]

Figure 1. Feasibility boundaries for achieving 250 m-EDI.   By Bill Chan, President, LiteController Inc. Shortly after my recent IES FIRES article, “Circadian Lighting in Offices: Feasibility Boundaries and Design Trade-Offs” was published, an architectural lighting designer left a comment on LinkedIn: “Nowadays, it’s getting [to be] a real Mission Impossible!” That brief comment perfectly [...]

  By Gary Satanovsky, Product Design and Marketing Manager, NuWatt Lighting Since the earliest days of electric light, illumination has played a central role in keeping people and property safe after dark. Along the way, security lighting became governed by a simple, seemingly intuitive principle: brighter spaces are safer spaces. And while that assumption – higher [...]

    By Szymon Slupik, President & CTO, Silvair Energy saving is the primary feature of lighting control systems. The concept is well known: dim the lights if there is enough sunlight (daylight harvesting controls) or turn the lights off when there are no people in the room (occupancy / vacancy – based controls). The [...]

By Eric Bretschneider, Ph.D Excerpts from a larger technical report, linked below. 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 62471:2006 Photobiological Safety of Lamps and [...]

  By Brian Liebel & Rick Utting, DarkSky International, Tucson, AZ. Executive Summary Upward-emitted outdoor light has long been identified as a source of atmospheric light pollution, a.k.a. sky glow. This form of light pollution is an obvious contributor to the brightening of the nighttime sky and can be observed as glowing domes of light [...]