Research published in Sustainabilityindicates that even apparently low levels of outdoor light at night can degrade human lives. A research team lead by Grubisicdetermined that “even low light intensities of urban skyglow can suppress melatonin production. Melatonin synchronizes the day-night-rhythm in animals and humans. It adjusts the circadian clocks of cells, tissues and organs, and regulates other seasonal processes like reproduction. . . .
Researchers are developing a more nuanced understanding of when it is best to use lights of various colors and intensities. A press release from the University of Manchester reports that “Contrary to common belief, blue light may not be as disruptive to our sleep patterns as originally thought - according to University of Manchester scientists. According to the team, using dim, cooler, lights in the evening and bright warmer lights in the day may be more beneficial to our health.
How can parking lot lighting help people in those lots at night feel safe? Bullough, Snyder, and Kiefer investigated this issue, finding that “Previously published research has indicated that perceptions of safety and security under outdoor illumination are correlated with perceptions of scene brightness, which in turn are influenced by the light level in the lot, by the spectral distribution of the illumination, and the uniformity of illumination. . . .
Bhattacharjee and Pal studied the implications of spotlighting paintings in dimly lit rooms with light of different colors. They determined that “the appearance of paintings changes due to different CCTs [correlated color temperatures] of LEDs having the same illuminance.
Researchers at the Lighting Research Center (LRC) at Rensselaer and the US General Services Administration (GSA) conducted important research related to at-work alertness and nighttime sleep. During their study “luminaires, mounted near the participants’ computer monitors provided: (1) morning saturated blue light delivering a circadian stimulus (CS) of 0.4, (2) midday polychromatic white light delivering a CS of 0.3, and (3) afternoon saturated red light delivering a CS close to zero. . . .
Pelowski and colleagues studied how gallery lighting influences appraisals and emotional experience of visual art. They report that when “Participants viewed a selection of original representational and abstract art under three different CCT [temperature] conditions. . . . The selected lighting temperatures were chosen based on an initial investigation of existing art museums within the Vienna area. . . . We also allowed the same participants to set the light temperature themselves in order to test hypotheses regarding what might be an ‘ideal’ lighting condition for art.
Adhering to guidelines no guarantee of higher satisfaction
Opinions of others affected
Cajochen and colleagues investigated the effects of using LEDs that mimic daylight on user experi
Huang and colleagues studied preferences for different lighting conditions.