Effects of Illuminance Distribution, Color Temperature and Illuminance Level on Positive and Negative Moods

Abstract

This study investigates how artificial lighting affects people's positive and negative moods, and ascertains the features of lighting environments that more effectively increase positive moods or heal negative moods. The evaluation techniques are subjective evaluation (POMS and VAS). This study discusses 10 lighting environments, which contain different color temperatures, illuminance levels and illuminance distribution types. The findings showed that general lighting can increase people's positive moods to a higher level; however, indirect/ambient lighting is better able to reduce people's negative moods. As to color temperature, 2700K is more advantageous to moods than 6500K in direct/central and indirect/ambient lighting. However, color temperature has very little impact on moods in general lighting. As for illuminance level, moods between 780lx and 1500lx were insignificant. These findings mean that the single factor of lighting may not be influential. The interaction effect of lighting factors plays an important role in moods.

Lighting in the Workplace as the Visual Environment That Affect the Occupant’s Mood: A Literature Review

“…Increasing a positive mood due to the effect of direct lighting during the experiment is confirmed in real conditions [78]. The placement of general lighting has the potential to increase the level of a person's positive mood, while indirect or ambient lighting is better for reducing negative mood levels [50]. Ambient lighting significantly influences brain activity and is a requirement as a biological marker for environmental change [79].…”

“…Mood is different from emotions where the latter are more intense and focused or related to someone or something [47]. Positive mood can be a state manifested in strength, friendliness and satisfaction [50]. The presence of plants in a room, or the arrangement of shelves and magazines, can improve the mood of the occupants of that room when compared to a room that has no greenery or magazine racks [51].…”

“…Improved sleep quality can have a significant impact on the moods of people; those with and those without mood disorders [54]. A negative mood is often resulting in stress, depression, nervousness, and fatigue [50]. Climate and weather can also affect a person's mood, although only slightly.…”

Optoelectronic system and device integration for quantum-dot light-emitting diode white lighting with computational design framework

“…4l are the snapshots of the fabricated lighting system emitting reddish, white, and bluish lights at the applied voltages of 3 V, 5 V, and 7 V, respectively. Owing to the wide colour controllability, the optimised white lighting system is able to respond to most of the colour preferences affected by the circadian rhythm for daily life (temporal difference), region/culture (spatial difference), or lighting context (situational difference) [48][49][50][51][52] . In addition, the colour locus of the optimised white lighting system traces close to the Planckian locus over the entire voltage range, enabling it to express a more precise colour close to the specified CCT (Supplementary Fig.…”

Environmental experience design research spectrum for energy and human well-being

“…A low or high color temperature corresponding to a low or high level of illuminance is empirically assessed as being pleasant or neutral ( Kruithof, 1941 ). In general, the studies indicate that lower illuminance and color temperature (warm color) are more likely to enhance positive mood ( Hsieh, 2015 ). However, elevated illumination suppressed the melatonin release significantly, which is linked to higher alertness.…”