This course describes the characteristics of LEDs and discusses situations where LEDs would be appropriate and other situations where traditional light sources should be chosen instead.
LEDs (Light-Emitting Diodes) are semiconductor devices that emit light through electroluminescence. This basic fact is the foundation for many of the advantages of LEDs, since the source of LED light is different from traditional light sources. Some of the potentially favorable characteristics of LEDs compared to traditional lamps include directional light emission, wide size and form factor choice, resistance to mechanical failure (i.e., breaking), instant “on” at full output, rapid on-off cycling capability without detrimental effects, improved performance at cold temperatures, dimming and control capability, opportunity for color tuning, minimal nonvisible radiation [e.g., ultraviolet (UV), infrared (IR)], and extended lifetime. But even though LEDs have advantages over traditional lamps, generalized comparisons are often misrepresentative. For example, no matter how much energy can be saved using an LED, if the product does not meet all the performance requirements of a given application, it is not a good design choice. This course describes the characteristics of LEDs and discusses situations where LEDs would be appropriate and other situations where traditional light sources should be chosen instead. Health and safety issues of LEDs are also discussed.
Topics: Using LEDs to their best advantage Knowing how to establishing LED equivalency Knowing about LED lifetime and reliability characteristics Understanding the characteristics of general service LED lamps Learning about optical safety of LEDs Knowing about aspects of lighting related to health Understanding flicker Learning about energy efficiency of LEDs.
Intended Audience: This course is intended for mechanical, civil, and transportation engineers concerned with the design and maintenance of lighting systems for buildings and outdoor facilities.
Publication Source: US Dept of Energy
Civil Engneering faculty member for 27 years
Dr. Rossow is a graduate of the University of Michigan with B.S., M.S., and Ph.D. degrees. He is a licensed Professional Engineer in the State of Illinois. He taught civil engineering for over 35 years, including six years at Washington University in St. Louis and 29 years at Southern Illinois University Edwardsville, where he was the Chair of the Civil Engineering Department for ten years. His areas of expertise are in civil engineering and mechanics. He has consulted for various organizations, including government agencies and an international offshore drilling company. He has published numerous technical journal articles and technical reports for a variety of governmental agencies and private sector organizations. Mark P. Rossow, PE, PhD Licensed Professional Engineer in State of Illinois License No. 062.040560 Dr. Rossow is a graduate of the University of Michigan with B.S., M.S., and Ph.D. degrees. He taught civil engineering for over 35 years, including six years at Washington University in St. Louis and 29 years at Southern Illinois University Edwardsville, where he was the Chair of the Civil Engineering Department for ten years. His areas of expertise are in civil engineering and mechanics. He has consulted for various organizations, including government agencies and an international offshore drilling company. He has published many journal articles and technical reports.
