Atmosphere perception of dynamic LED lighting over different hue ranges

Abstract

This paper investigates the atmosphere perception of dynamic coloured lighting over warm and cool hue ranges in a living room. Experiments were carried out with eight fully functional multi-channel tunable LED luminaires. Thirty Chinese observers (14 males and 16 females) evaluated 36 light conditions (2 luminance ×2 chroma ×3 hue range types ×3 speeds) using a questionnaire of 25 response scales. Four atmosphere factors were extracted: coziness, spaciousness, liveliness and warmth. Both dynamics and hue range significantly affected the atmosphere perception.

Perceived speed of changing color in chroma and hue directions in CIELAB

“…The development of light-emitting diode (LED) technology has enabled easy and inexpensive ways to create dynamic colored light. As a result, dynamic colored light is nowadays used in several applications, for instance, to enhance the alertness of office workers [1], to create appealing light atmospheres [2][3][4][5], and to enhance the immersive experience of displays, such as in the Philips Ambilight TV [6]. In most of these applications, the light has to fulfill (at least) the following two requirements in order to be attractive to observers: the light should change smoothly over time, in luminance and/or chromaticity, and the light should change at the desired rate of change (or speed) [4,7,8].…”

LED lighting system for better color rendition space: the effect of color rendering index

“…For the brightness evaluation, brightness (1 = dim, 7 = bright), color temperature (1 = cool, 7 = warm), and preference (1 = dislike, 7 = like) were used. The atmosphere perception questionnaire of Li et al (2019), which consists of 22 questions, was used. Mehrabian and Russell's PAD scale, which includes six questions about pleasure and six questions about arousal, was also used.…”

“…The CIE Ra can be affected by LED SPDs. Several researchers (Vogels 2008;Erp 2008;Steidle and Werth 2013;Wang et al 2014;Wei et al 2014;Islam et al 2015;Li et al 2019) have examined LED lighting results with very different user emotional responses and cognitive activity assessments. Wei et al (2014) compared blue-pumped LED (BP-LED) lamps with BP-LED lamps that had diminished yellow emission (YD-LED), evaluating brightness and preference.…”

“…Their study revealed that subjects rated a high-quality setting as more pleasurable than hard-discounter setting. Many studies (Vogels 2008;Erp 2008;Wang et al 2014;Li et al 2019) have developed PAD model. Li et al (2019) investigated atmosphere perception under 36 LED SPDs, and extracted four atmosphere factors: coziness, spaciousness, liveliness, and warmth.…”

“…Many studies (Vogels 2008;Erp 2008;Wang et al 2014;Li et al 2019) have developed PAD model. Li et al (2019) investigated atmosphere perception under 36 LED SPDs, and extracted four atmosphere factors: coziness, spaciousness, liveliness, and warmth. In their study, brightness for the lit environment was assessed with the term dim-bright.…”