<str<strong>on</strong>g>licht</str<strong>on</strong>g>.<str<strong>on</strong>g>wissen</str<strong>on</strong>g> <str<strong>on</strong>g>19</str<strong>on</strong>g> <str<strong>on</strong>g>Impact</str<strong>on</strong>g> <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>Light</str<strong>on</strong>g> <strong>on</strong> <strong>Human</strong> Beings 65 66 67 68 69 44
Domestic lighting Dynamic lighting can also c<strong>on</strong>tribute significantly to wellbeing at home. Complete circadian lighting soluti<strong>on</strong>s are still fairly rare at present. But with the correct choice <str<strong>on</strong>g>of</str<strong>on</strong>g> luminaires and lamps, domestic lighting can be put <strong>on</strong> the right basic footing. We all need light to wake up and feel fit. The right lighting helps improve quality <str<strong>on</strong>g>of</str<strong>on</strong>g> sleep and wellbeing and – especially in the dark m<strong>on</strong>ths <str<strong>on</strong>g>of</str<strong>on</strong>g> the year - fight <str<strong>on</strong>g>of</str<strong>on</strong>g>f the widespread winter blues. This is c<strong>on</strong>firmed by a study c<strong>on</strong>ducted at a wellness hotel by a team from Wuppertal University. 80 test pers<strong>on</strong>s took part in the study, which permitted c<strong>on</strong>clusi<strong>on</strong>s to be drawn about domestic lighting. More active and more rested While half <str<strong>on</strong>g>of</str<strong>on</strong>g> the participants were exposed for two days to normal, typical hotel lighting, the other half spent two days under lighting that changed in brightness and colour like natural sunlight. During the day, they enjoyed cool white light with a high blue c<strong>on</strong>tent and high illuminance; in the evening, that turned to subdued warm white light with a greater red c<strong>on</strong>tent. The result: participants went to sleep more easily woke up less frequently were more alert and more active during the day. Activating light in the morning The positive lighting effects can also be harnessed at home – and are particularly useful during the winter and when the clocks change. Any<strong>on</strong>e who cannot spend much time outdoors should make sure they get enough exposure to daylight or cool white artificial light (light sources with ratings above 5,300 kelvin or corresp<strong>on</strong>ding LED lamps). Experiments at the sleep lab <str<strong>on</strong>g>of</str<strong>on</strong>g> the Charité Psychiatric University Hospital in Berlin have c<strong>on</strong>firmed that even with the use <str<strong>on</strong>g>of</str<strong>on</strong>g> c<strong>on</strong>venti<strong>on</strong>al lamps emitting daylight or cool white light, melat<strong>on</strong>in producti<strong>on</strong> is significantly reduced within ten minutes – the signal to sleep is not given. Activating light in the morning, e.g. in the form <str<strong>on</strong>g>of</str<strong>on</strong>g> planar general lighting in the bathroom or at breakfast in the kitchen, ‘kick-starts’ the body. <str<strong>on</strong>g>Light</str<strong>on</strong>g> therapy Many people suffer from light deficiency symptoms during the darker m<strong>on</strong>ths <str<strong>on</strong>g>of</str<strong>on</strong>g> the year. They feel tired and listless and experience mood swings that can develop into seas<strong>on</strong>al affective disorder (SAD). SAD can be effectively treated at home using small light therapy devices. They radiate planar cool white light in the short-wave blue regi<strong>on</strong>. Quality devices reliably deliver colour temperatures from around 6,500 to 10,000 kelvin, which is similar to daylight. <str<strong>on</strong>g>Light</str<strong>on</strong>g> alarm clock for a good start to the day Biologically effective light is also provided by special light alarm clocks. 30 minutes before the wake-up time set, they raise the illuminance in the room, simulating the sun’s strengthening rays at dawn. The sleeper is woken naturally and feels rested and refreshed. In the case <str<strong>on</strong>g>of</str<strong>on</strong>g> SAD patients, the improvement in their morning mood is comparable to the effect <str<strong>on</strong>g>of</str<strong>on</strong>g> medicati<strong>on</strong>. The level <str<strong>on</strong>g>of</str<strong>on</strong>g> cortisol is also significantly higher than when a light alarm clock is not used. Users start the day full <str<strong>on</strong>g>of</str<strong>on</strong>g> energy – and get up within an average <str<strong>on</strong>g>of</str<strong>on</strong>g> nine minutes. Without a light alarm, it can take them up to 25 minutes to get out <str<strong>on</strong>g>of</str<strong>on</strong>g> bed. Relaxing light in the evening In the evening, the body should be prepared for sleep. So, at least two hours before going to bed, warm white light with a low blue c<strong>on</strong>tent is recommended to promote melat<strong>on</strong>in producti<strong>on</strong>. Halogen lamps and corresp<strong>on</strong>ding warm white LEDs are a suitable soluti<strong>on</strong>. Apart from that, lighting in the evening should be spot-like – directi<strong>on</strong>al, not planar. This also applies to bedside reading lights. Any<strong>on</strong>e who spends a l<strong>on</strong>g time at a computer in the evening should check the specificati<strong>on</strong>s <str<strong>on</strong>g>of</str<strong>on</strong>g> the m<strong>on</strong>itor: modern LED m<strong>on</strong>itors generally have a high blue c<strong>on</strong>tent, which has an activating effect. It is therefore better to switch <str<strong>on</strong>g>of</str<strong>on</strong>g>f the PC two hours before going to bed or change the screen to an appropriate setting. Many LED luminaires and lamps today <str<strong>on</strong>g>of</str<strong>on</strong>g>fer different nuances <str<strong>on</strong>g>of</str<strong>on</strong>g> white light and even coloured light. Fitted with a digital c<strong>on</strong>troller, they can thus be regulated to provide the right light at the right time in the home. [65] Daylight white light coupled with high illuminance in the bathroom ‘kick-starts’ the body in the morning. [66 – 68] The right light at the right time: stimulating during the day, relaxing in the evening. [69] <str<strong>on</strong>g>Light</str<strong>on</strong>g> alarm clocks simulate sunrise: users wake up naturally and feel refreshed. 45