Abstract: With increasing interest in LED lighting applications, this webinar starts by exploring LED characteristics. The Taylor series expression-based model is introduced to describe LED V-I characteristic curves. According to four parameters: 1) maximum operating point; 2) rated operating point; 3) knee point; and 4) temperature coefficient available in the manufacturer�s datasheets, the voltage-controlled piece-wise linear model can be built for circuit simulation work. The DC and AC equivalent circuit models of LEDs can be derived for system analysis and design. Presenter Bio: Ray-Lee Lin received his Ph.D. degree in electrical engineering from the Virginia Polytechnic Institute and State University (VA Tech), Blacksburg, VA, USA, in 2001. Currently, he is with the Department of Electrical Engineering, National Cheng Kung University, Tainan City, Taiwan, as a professor. From 2000 to 2002, he was employed by GE Lighting in Cleveland, Ohio, USA, as an electronics design engineer working to design and develop cost-effective, high-performance lighting drivers. Since 2009, he has been dedicated in the research on solid-state lighting drivers and published a series of technical papers related to the modeling and system design of solid-state lighting drivers. In addition, he has received three prize paper awards from the Technical Committee of Industrial Lighting and Display, IEEE Industry Applications Society. He is a registered professional engineer in the Commonwealth of Virginia, USA.