《Talk》Solid-State Lighting for Both Conscious and Subconscious Vision
Please feel free to come.
Time : Dec. 5, 2016 ( Monday, 3:30~5:20 pm )
Venue : Room B27, B1 of Engineering Building 4, National Chiao Tung University
Prof. P.C. Ku
Electrical Engineering and Computer Science, University of Michigan
Language : Lectured in Chinese
Light not only enables us to see but has profound impacts to our well-being. Recently, solid-state lighting based on LEDs and OLEDs has revolutionized the illumination design with a significantly improved energy efficiency. The accompanied potential health impacts of overexposure to the blue light at night have also become a topic of renewed interests as well as concerns. But little is known that the quality of general illumination in the daytime is equally if not more important. Inadequate daylight exposure has been linked to poor sleep quality, seasonal affective disorder (SAD) and depression. The recommended illuminance of indoor lighting is typically 20 to 100-fold lower than outdoor levels which is insufficient to properly stimulate subconscious physiological responses such as suppression of nocturnal melatonin release and entrainment of circadian rhythms. Boosting daytime light exposure via bright blue or very high color-temperature white lights has been found to improve sleep quality, reaction times, alertness, and ameliorate SAD symptoms, but is impractical to be implemented for general illumination. In this work, we introduce a new lighting concept based on multiple temporally modulated LEDs, which can be readily implemented using advanced LED technologies, to enhance subconscious visual responses at a typical indoor illumination level.