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6 DESIGN Glare The eye can adjust to very high luminance levels, which means that glare is all about contrast. If the contrast in a space is suddenly too high, it can be very disturbing and glary. This can happen, in an open fixture with a naked light bulb or if there is a very bright surface on the fixture. Natural glare will happen when direct sunlight hits a vertical surface and reflects on the eye. Disturbance glare should be avoided in the lighting design, especially be- cause the patients might be extra sensitive to glare. (Pauley, 2004; Brawley, 2009) Flicker Flicker can be visible and invisible and is generally connected to the driver in cheap LEDs. Dimming can be another factor that can cause flicker. The visible happens, when a light source changes light intensity very rapidly. The problem is known from fluorescent (120Hz) lamps. The human eye can de- tect a flicker frequency < 100 flashes/sec. In high quality fixtures, the visible flicker should be minimised, as this can be very disturbing, and in some peo- ple, it can cause epileptic seizures. Invisible flicker is an even bigger prob- lem, as it is present but cannot be noticed by the human eye. This can cause disturbances such as eyestrain, headaches, dizziness and general symptoms of feeling sick. (Boyce and M.Rea, 2001; van den Berg, 2005) 6.4 Circadian rhythm When working with patients who are hospitalised for longer periods of time, it is of high importance, that the CL has a positive impact on the CR of pa- tients. From the literature review [section 2.3] and the discussion [section 3.3.3] we know how to reset and disrupt with light pulses as the main Zeit- geber. ” Light is the most powerful environmental entraining stimulus and daily ocular exposure to a 24-hour light-dark cycle is required to reset the internal pacemaker to 24 hours. ” (Pechacek, Andersen and Lockley, 2008) A recent study found, that a thoughtful introduction and control of light, both natural and artificial, not only aid and speed up the healing process for patients, but also significantly improve the performance of hospital staff, undertaking a variety of visual tasks. (Joseph, 2006) In this lighting design concept, the CR will be supported according to seasons, daily schedule and biological clock in the target group. Master thesis · MSc Lighting Design · Pernille Bech-Larsen · Fall 2017 81PDF Image | Healing with light
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