Human Factors Study on Light Modulation in Indirect Office Lighting

Abstract

Our goal is to provide insight into the human experience of light modulation to help achieve the specific application goals of indirect office lighting. This paper explains experimental development and design, and results from a human factors experiment for an indirect office lighting application. 18 subjects experienced working for a day in a 4x4 meter office equipped with an extended cove, housing LED light modules, providing indirect lighting that varied at 2 light modulation levels and a no modulation control condition. The light modulated at a frequency of 100 Hz due to the electronic design of the rectification of the AC line voltage. The results show that subjects had little to no response for the 29% light modulation level and the 0% control. Considerable undesirable response was measured with 100% modulation. In addition we see considerable variation from subject to subject. The type of information contained in this paper is used in making decisions on design trade-offs by product development teams.

Reduced Flicker Lighting Enhances Theta-Band Phase Synchrony during Working Memory Tasks

“…5 Moreover, subjective evaluation of the light flicker at 100 Hz revealed that 100% modulation depth had undesirable effects, whereas 29% modulation depth and 0% control were acceptable to office workers. 6 However, to date, little is known about the neurophysiological mechanism by which light flicker conditions affect emotions and neurocognitive performance.…”

The effect of stroboscopic effect on human health indicators

“…Based on the methods used in the study of the stroboscopic effect, some researchers tried to use questionnaires and scales to prove that stroboscopic visibility was closely related to human responses, both psychologically and physiologically. For example, Olsen et al 11 designed Likert scales, interviews and questionnaires to study the environmental evaluation and self-assessments from office workers for different stroboscopic effects in 2014. The strobe caused discomfort among subjects who were exposed to such an effect for a long time.…”