Human sight evolved to optimize vision under diffuse sky radiation, and this remains the best illumination conditions for most of our activities. Luminous ceilings are an attempt to reproduce the qualities of such overhead lighting in an indoor environment.
Explored in the August 2017 issue of The Construction Specifier, a luminous ceiling system is designed to provide a substantially uniform level of illuminance throughout the room below. The entire ceiling is, in effect, one large luminaire consisting of a continuous surface of light-transmitting material of a diffusing or light-controlling character, with light sources mounted above it. This article examines construction costs and maintenance requirements.
The American Medical Association’s (AMA’s) recent report, “Human and Environmental Effects of Light-emitting Diode (LED) Community Lighting,” has ignited controversy in the lighting industry with its recommendations regarding blue light.
Museums employ two key strategies for lighting works of art: daylighting and artificial or electric lighting. (The author would like to thank Thomas Holzmann and Gregory Weithman, AIA, for their contributions to this article.)
Using guidelines developed by the Lighting Research Center (LRC) of Rensselaer Polytechnic Institute, the Sacramento Municipal Utility District (SMUD), ACC Care Center, and U.S. Department of Energy (DOE) have collaborated on a lighting retrofit and research project examining the effect of lighting on the melatonin levels of the care center’s residents.