Development of an Objective Concentration Index for Indoor Work Lighting(2/2)

This proposal aims to develop an objective concentration index for indoor work lighting, and toconstruct an ergonomic-based control model for smart lighting. In this era of human centric technologies,how to effectively manage and control the lighting systems have become important research topics. Smartlighting technology facilitates sensor-based remote control on the luminosity, color temperature and usageoccasions to offer lighting environments with energy efficiency and users’ well-being.This project will investigate the effects of different lighting conditions on the concentration, visualcomfort, visual fatigue, and task performance of participants in an office environment. Psychophysicalexperiments will be performed to obtain subjective ratings through questionnaires and to acquire objectivemeasures on critical flicker frequency, frontal lobe brain wave, and task performance. The experimental datawill be utilized to model the subjective ratings or objective measures as functions of color temperature andtask illuminance. A luminaire control model for indoor work lighting can then be established based on thefitted models with adjustable weighting factors.The acquired brain wave signals for the two states of work and relaxation will be decomposed byempirical mode decomposition into several intrinsic mode functions (IMFs). Candidate concentrationindexes will be calculated from the marginal spectrum of each IMF. The receiver operating characteristicanalysis will be utilized to select the optimal concentration index based on the classification accuracy.