No abstract

This document is a report of observations and results obtained from a lighting evaluation project conducted under the U.S. Department of Energy (DOE) GATEWAY Program. The program supports evaluations and demonstrations of high-performance solid-state lighting (SSL) products in order to develop empirical data and experience with in-the-field applications of this advanced lighting technology. The DOE GATEWAY Program focuses on providing a source of independent, third-party data for use in decision-making by lighting users and professionals; this data should be considered in combination with other information relevant to the particular site and application under examination. Each GATEWAY evaluation compares SSL products against the incumbent technologies used in that location. Depending on available information and circumstances, the SSL product may also be compared to alternate lighting technologies. Though products used in the GATEWAY program may have been prescreened for performance, DOE does not endorse any commercial product or in any way guarantee that users will achieve the same results through use of these products. vii Flicker can result from an incompatible pairing of a LED driver and a dimmer, an incompatible driver and transformer, or a combination of all three. The likelihood of introducing annoying flicker to gallery spaces can be considerably reduced if manufacturer dimming compatibility tables are heeded. Lighting controls can eliminate 60% or more of the wasted lighting energy in buildings and would enable the museum lighting designer to specify lighting exposure (illuminance, spectrum, time) to minimize damage while providing optimal viewing conditions. A growing and more sophisticated set of controllable LED light sources and complementary control technologies are becoming available. Lessons Learned Finally, in a world of information overload, what LED technical requirements are really needed for museum lighting? The museum lighting survey elicited many telling responses from individuals who had experience with LED products, and the report includes lessons learned from their trials and tribulations.

These resources included assistance and guidance writing scripts to execute the SkyGlow Simulator model along with the use of a supercomputer, Constance, and ultimately a Windows HPC cluster, housed at PNNL's headquarters in Richland, WA.  Ian Ashdown, President at by Heart Consultants, contributed an early model SkyGlowCalc and shared a significant amount of time and effort investigating not only the numerous models available but also the literature discussing the various impacts to sky glow.  Marc Ledbetter, Program Manager of PNNL's Solid-State Lighting, provided direction, insight, and numerous hours of peer review.  Jim Brodrick, Lighting Program Manager for the U.S. Department of Energy in the Building Technologies Office, supported this project and provided unending patience.

No abstract

No abstract