Sustainable Building Design

**3**

**1. Introduction**

**Chapter 1**

**Abstract**

A Human-Centric Qualitative

Daylighting Interventions in

Current literature highlights the importance of human-centric lighting (HCL) design interventions in the built environment that move beyond energy-centric approaches and focus on occupant satisfaction, health, and well-being. A Midwest University interdisciplinary team conducts an evidence-based analysis of occupants' satisfaction, health, and well-being in state-funded buildings using the Sustainable post-occupancy evaluation survey (SPOES) and provides suggestions for improvements. SPOES is an online-administered questionnaire with a sevenpoint satisfaction-Likert-scale (very dissatisfied to very satisfied) and open-ended questions regarding occupants' satisfaction with indoor environmental quality (IEQ ) factors including daylighting and electric lighting. The authors present a thematic qualitative analysis of the impact of daylighting and electric lighting on occupants (N = 2690) in 13 workplace buildings surveyed from 2009 to 2017. Three themes were derived from the data. First, *insufficient access to daylighting and view*, respondents reported the lack of daylight and outdoor views due to isolated office-spaces and lack of windows. Second, *inadequate control of electric lighting*, respondents reported automatic lighting systems failed to meet task-specific needs while demanding excessive adjustments. Third, *poor integration between daylighting and electric lighting*, respondents preferred warmer color temperature lighting to cooler fluorescent lighting and reported amount of contrasts between daylighting

Analysis of Electric and

*Abimbola O. Asojo, Hoa Vo and Suyeon Bae*

and electric lighting caused eyestrains and migraines.

**Keywords:** human-centric, daylighting, electric lighting, well-being, workplace

Human-centric lighting (HCL) is an approach to lighting that considers occupants' needs for visuality, biology, and emotion in design [1]. In technical terms, HCL involves daylighting and dimmable electric lighting with large warm-to-cool color-changing-range (i.e., tunable LED). Especially, researchers at Harvard School of Medicine formed the Human Centric Lighting Committee as a way to acknowledge the significance of HCL to human well-being [2]. Current literature also highlights the importance of HCL design interventions in the built environment that move beyond energy-centric approaches and focus on

Workplace Buildings

#### **Chapter 1**
