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Energy Saving Solid State Lighting
Rapid progress in solid-state lighting (SSL) research and development has resulted in the advent of light-emitting diodes (LED) for general lighting applications. This section of the website provides information on the important performance characteristics of white light LEDs for general illumination, with particular emphasis on energy efficiency and lighting quality.
Energy efficiency of light sources can be characterized in several different ways. Luminous efficacy indicates how much light the source provides per watt of electricity consumed. This is stated in lumens per watt (lm/W). Another measure of energy efficiency is the total watts a device consumes in providing the intended service. Both measures are important to consider. For example, an LED-based refrigerated display case light has lower lumens per watt compared to linear fluorescent systems, but uses about half the total watts to provide the necessary lighting.
Lighting quality is a subjective term, but generally includes color quality (including appearance, color rendering, and color consistency); illuminance levels (the amount of light the light source provides on a task or surface); photometric distribution of the light source in a fixture or luminaire; lifetime; ease of maintenance; and cost.
This section is designed to provide useful information for energy efficiency program sponsors, utilities, government agencies, lighting fixture manufacturers, lighting designers, and others who are interested in energy-efficient lighting technology.
LED Basics
- LED basics
- Energy Efficiency
- Colour Quality
- LED Life
- Thermal Management
LED Applications
- Using LED To Best Advantage
- Recessed Downlights
- Kitchen Undercabinet Lighting
- Portable Desk/Task Lighting
- Outdoor Area Lighting
- Dimming LED
LED Measurements
- Solid State Lighting Standards
- Luminaire Efficacy
- Luminaire Reliability
Source: US Department of Energy
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