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Promoting smart homes
Published in Jenny Rinkinen, Elizabeth Shove, Jacopo Torriti, Energy Fables, 2019
However, smart lights are also marketed as ways of providing new sensory experiences in the home (more with less). ‘Mood lighting’, available through lighting scenes, is meant to induce or enhance inhabitants’ feelings, for example of invigoration or calm. Occupants are expected to use lighting to enhance the mood for meditation, housework or a party through the creation of scenes. As part of these possibilities, lighting may be incorporated into walls, under beds, or behind cupboards and benches via LED strip-lighting and back-lighting where previously lighting didn’t exist or wasn’t deemed necessary. Smart lighting is thus closely tied to generating ‘a luxurious aesthetic experience’ (Strengers and Nicholls, 2017, p. 2).
A Low-Cost, Wide-Range, CCT-Tunable, Variable-Illuminance LED Lighting System
Published in LEUKOS, 2020
Rajib Malik, Kalyankumar Ray, Saswati Mazumdar
Recent research findings indicate that biological and psychological systems of the human body can be controlled by appropriate light exposure (Belia et al. 2011; CIE 2004; van Bommel 2006; van Bommel and van Den Beld 2004). Exposure to light should be in terms of spectral composition (quality), illuminace level (quantity), as well as timing (Rea et al. 2002). Light incident on the subject sends signals via the photoreceptor cells and a separate nerve system to her or his biological clock, which in turn regulates the circadian (daily) and circannual (seasonal) rhythms of a large variety of bodily processes. Previous studies showed that the light can influence the secretion of cortisol and melatonin hormones (CIE 2004; van Bommel 2006; van Bommel and van Den Beld 2004). Melatonin and cortisol play important roles in terms of sleep and alertness, respectively. Cortisol levels increase in the morning and prepare the body for the coming day’s activity. It then decreases gradually but remains at a sufficiently high level to give sufficient blood sugar (and thus energy) over the course of the day, falling finally to a minimum at midnight. The level of melatonin is lowest in the morning and remains fairly flat until early evening. It then starts to increase, eventually reaching a maximum at midnight. It then falls to a minimum level in the next morning. Good health demands that these two rhythms are not disturbed too much. In the event of a disruption of the rhythm, bright light in the morning helps restore the normal rhythm. Color-tunable light sources also may be used for mood lighting, which affects human emotions (Lin and Lin 2015; McCloughan et al. 1999).