"Version: 20220901"--Title page verso.Includes bibliographical references.1. Introduction of LED solid-state lighting -- 1.1. The past, present, and future of LEDs -- 1.2. Working principle of LEDs -- 1.3. Luminous efficiency evaluation of LEDs -- 1.4. LED die and its package -- 1.5. Radiometry and photometry -- 1.6. Four-level optical designs and considerations2. Basic optics -- 2.1. Propagati…