
What You Need To Know About Energy
Energy Efficiency
Increasing the energy supply is not the only answer to a stable energy future. Reducing demand through the improved efficiency of devices and procedures has the same end result. Learn about energy efficiency “wins” from the past and areas showing potential for the future.
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Energy Hands-on
Understanding Efficiency
Learn the significance of energy efficiencyThe Promise of Better Lighting
Energy savings through lighting technologyOur Energy System
A visualization of all our energy sourcesEnergy Defined
- Lumen
A unit of luminous flux represents the amount of light emitted that is visible to the human eye. In the International System of Units, it is the amount of light a one candela source emits over a square radian angle. It is used in measuring and comparing the amount of light visible to the human eye produced by lamps such as light-emitting diodes, compact fluorescent lights, and incandescent bulbs.
National Academies
Search the National Academies Press website by selecting one of these related terms.
Source Material
- Real Prospects for Energy Efficiency in the United States (2010)
- Energy Research at DOE: Was It Worth It? Energy Efficiency and Fossil Energy Research 1978 to 2000 (2001)
- Effectiveness and Impact of Corporate Average Fuel Economy (CAFE) Standards (2002)
- Decreasing Energy Intensity in Manufacturing: Assessing the Strategies and Future Directions of the Industrial Energy Technologies Program (2005)
- Sustainability in the Chemical Industry: Grand Challenges and Research Needs--A Workshop Report (2005)