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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 271 records · Page 15
All sourcesNASA NTRSDOE OSTI
DOE OSTI2019

Accelerated Stress Testing of Multi-Source LED Products; Round 2

Second report in a series that uses accelerated stress testing (AST) to provide insights into the long-term behavior of commercial products utilizing different types of mid-power LEDs (MP-LEDs) integrated into the same LED module. The first report in the series provides initial AST results from two commercial lamps intended for use in horticulture applications and one tunable-white LED module intended for use in educational and office lighting applications. The second report focuses on determining the mechanisms of optical change in the same products.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗
DOE OSTI2018

Round 2 Update of Stress Testing Results for Organic Light-Emitting Diode Panels and Luminaires

Organic light-emitting diode (OLED) sources are a potential solid-state lighting technology for use in indoor lighting applications. Some of the advantages offered by OLEDs include thin profiles, low glare, diffuse lighting, and unique form factors. The U.S. Department of Energy (DOE) has released five reports about OLED technologies to provide information and analysis to the lighting industry. These reports include the evaluation of two different field deployment sites, a market analysis, and two independent assessments of the performance of select commercially available OLED products. This report builds on earlier DOE efforts with OLED technology by updating information about previously benchmarked OLED products (i.e., the Chalina luminaire from Acuity Brands and the Brite 2 and Brite Amber panels from OLEDWorks) in accelerated stress tests (ASTs). In addition, this report also provides an initial analysis of the performance of recently released OLED products—the Brite 3 panels from OLEDWorks.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗
DOE OSTI2019

Energy Saving Opportunity from Advanced LED Lighting Research

Pacific Northwest National Laboratory (PNNL) was asked by the U.S. Department of Energy (DOE) to estimate the energy saving opportunity made possible by certain lighting research planned by PNNL. This report describes the results of that effort. To complete this work, PNNL selected a methodology created for and used in the electric utility industry, called Non-Energy Benefits methodology, and a lighting market model created for DOE to estimate future energy savings potential from solid-state lighting. The study found that select planned PNNL lighting research could lead to annual energy savings of 10% of total lighting energy savings in the year 2035, or in absolute terms, 334 tBtu. Energy savings in earlier years are smaller, primarily due to the early years of low market uptake of the new technologies expected from PNNL lighting research. In 2030, annual energy savings are projected to be 4.5%, or 165 tBtu.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗
DOE OSTI2024

Graph learning for particle accelerator operations

Particle accelerators play a crucial role in scientific research, enabling the study of fundamental physics and materials science, as well as having important medical applications. This study proposes a novel graph learning approach to classify operational beamline configurations as good or bad. By considering the relationships among beamline elements, we transform data from components into a heterogeneous graph. We propose to learn from historical, unlabeled data via our self-supervised training strategy along with fine-tuning on a smaller, labeled dataset. Additionally, we extract a low-dimensional representation from each configuration that can be visualized in two dimensions. Leveraging our ability for classification, we map out regions of the low-dimensional latent space characterized by good and bad configurations, which in turn can provide valuable feedback to operators. This research demonstrates a paradigm shift in how complex, many-dimensional data from beamlines can be analyzed and leveraged for accelerator operations.

43 PARTICLE ACCELERATORS↗
DOE OSTI2012

CALiPER Year in Review 2012

The CALiPER program has tested more than 500 products since its inception in 2006, revealing a variety of performance trends, holding manufacturers accountable for claims, and identifying concerns that limit adoption. Over the past six years, the LED marketplace has changed substantially; previously relegated to niche status, LED products are now a viable alternative in many product categories and market share is expected to grow rapidly. This document summarizes recent testing results and provides an overview of multiyear trends.

caliper, ssl, eere, led, lighting, review↗
DOE OSTI2013

Optical Safety of LEDs

Solid-state lighting program technology fact sheet that clarifies the issue of LED lighting safety for the human eye and takes a look at current standards for photobiological safety.

ssl, LED, lighting, safety, eye, blue light, optic↗
DOE OSTI2013

Flicker

Solid-state lighting program technology fact sheet that discusses flicker metrics, contributing factors, and consequences in addition to comparing the flicker attributes of a sample of conventional and LED sources.

flicker, ssl, lighting, LED, modulation, metrics↗
DOE OSTI2013

Energy Efficiency of LEDs

Solid-state lighting program technology fact sheet on energy efficiency of LEDs, characterizing the current state of the market and discussing package efficacy, luminaire efficacy, and application efficacy.

ssl, lighting, energy, efficiency, LED, efficacy, ↗
DOE OSTI2012

LED Directional Lamps

Solid-state lighting program technology fact sheet that provides an overview of the current performance of LED PAR-, BR-, R-, and AR-shaped lamps, which were all investigated by CALiPER in 2012.

ssl, lighting, LED, lamp, PAR, incandescent, halog↗
DOE OSTI2013

Lifetime and Reliability

Solid-state lighting program technology fact sheet that discusses failure, lifetime, and reliability as they relate to LED-based products.

SSL, LED, failure, lifetime, reliability, fail, li↗
DOE OSTI2015

Manufacturing R&D Initiative Lowers Costs and Boosts Quality

Fact sheet that provides an overview of DOE's Manufacturing R&D Initiative, which supports projects aimed at developing better-performing, lower-cost solid-state lighting while encouraging engineering and manufacturing in the United States.

doe, ssl, solid-state, lighting, LED, manufacturin↗
DOE OSTI2014

True Colors

DOE Solid-State Lighting Program technology fact sheet on LEDs and the relationship between CCT, CRI, optical safety, material degradation, and photobiological stimulation

DOE, SSL, technology, fact sheet, LED, lighting, c↗
DOE OSTI2014

Guest Room Lighting at the Hilton Columbus Downtown

At the Hilton Columbus Downtown hotel in Ohio, DOE's Better Buildings Alliance conducted a demonstration of Next Generation Luminaires-winning downlights installed in all guest rooms and suites prior to the hotel's 2012 opening. After a post-occupancy assessment, the LED downlights not only provided the aesthetic appearance and dimming functionality desired, but also provided 50% energy savings relative to a comparable CFL downlight and enabled the lighting power to be more than 20% below that allowed by code. This document is a summary case study of the report.

gateway, ssl, doe, solid-state, better buildings, ↗
DOE OSTI2013

LEDs for Street Lighting—Here Today

Fact sheet that provides a brief overview of the viability of LED street lighting in municipalities and highlights case studies of two cities—Los Angeles and Seattle—that have invested in LED street lighting.

ssl, solid-state, lighting, street light, streetli↗
DOE OSTI2014

Upgrading Troffer Luminaires to LED

Solid-state lighting technology fact sheet providing guidance on the various factors to consider when deciding on an LED upgrade for a fluorescent troffer system.

SSL, solid-state, lighting, troffer, LED, luminair↗