Magical Mystery Devices or Not: How do LED Lamps and Luminaires Really Measure-Up?
Solid-state lighting products for general lighting applications are now gaining a market presence, and more and more people are asking, “Which of these are ‘good’ products? Do they perform as claimed? How do they compare? Light Emitting Diodes (LEDs) differ from other light sources enough to require new procedures for measuring their performance and comparing to other lighting options, so both manufacturers and buyers are facing a learning curve. The energy-efficiency community has traditionally compared light sources based on system efficacy: rated lamp lumens divided by power into the system. This doesn’t work for LEDs because there are no standard LED “lamp” packages and no lamp ratings, and because LED performance depends heavily on thermal, electrical, and optical design of complete lighting unit or ‘luminaire’. Luminaire efficacy is the preferred metric for LEDs because it measures the net light output from the luminaire divided by power into the system.
- Publication Date:
- OSTI Identifier:
- Report Number(s):
BT0301000; TRN: US200903%%335
- DOE Contract Number:
- Resource Type:
- Resource Relation:
- Conference: 2008 ACEEE Summer Study on Energy Efficiency in Buildings, proceedings , Paper # 479
- American Council for an Energy Efficient Economy, Washington DC, United States(US).
- Research Org:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
- Sponsoring Org:
- Country of Publication:
- United States
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; DESIGN; ENERGY EFFICIENCY; LIGHT EMITTING DIODES; PERFORMANCE; LIGHTING SYSTEMS