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6 DESIGN 6.5 Circadian lighting In order to answer the final research question, a customised schedule for the CL in PCBA ED 55 will be designed, focusing on enhancing the day and night activities while supporting the CR of patients and staff. [section 2.6.2 and 3.3.3] The most important thing is to ensure the right light at day and to pro- vide darkness at night. The artificial light should support the natural light dur- ing the day and provide for sufficient light at night, without erasing the night. By implementing CL in the building, the CR will be the focus of the lighting design. Three CL designs will be suggested, sufficient for the winter, summer and equinox. Temporary locations within the facility have been excluded from the CL due to effect based on exposure time. (Pechacek, Andersen and Lock- ley, 2008; Wood et al., 2013) Spring Equinox (Mar 21st) Summer solstice (June 21st) Fall Equinox (Sep 21st) Winter solstice (Dec 21st) 6.5.1 Day Civic twilight 5:34 19:03 3:24 23:00 6:16 19:49 7:51 16:26 Sunrise 6:11 4:26 6:53 8:38 Sunset 18:26 21:59 19:13 15:39 Sun high 12:18 13:12 13:04 12:09 In the northern hemisphere, the daylight exposure during the winter, does not provide for sufficient amounts of light to stimulate the circadian rhythm, or for the daily production of vitamin D. Daylight has more qualities than artificial light, but habits of living and working indoors require for artificial lighting, even during daytime. [section 2.7 and 3.3.12] Transition time, from dusk and dawn, into the blue hour and into sunrise or sunset, is part of the daily cycle. (#Table 3 + graphic 4 with daylight sched- ules) This period of time demands a high focus on light levels, as the transi- tion will create a feeling of darkness inside a room, because of the contrast to the window, as the change in natural light adds high contrast to a space and make it feel dark, even though light levels are higher than at night. The low sun, (see sun paths Appendix #C) also provide high risk of veiling glare, which induces people to turn down the blinds or block out the sun in Table 3, seasonal dusk/dawn Graphic 4, seasonal daylight sched- ules including sun paths (Almanak / Torben Herbansen, no date) Master thesis · MSc Lighting Design · Pernille Bech-Larsen · Fall 2017 85PDF Image | Healing with light
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