LUX REVIEW - Charles D'Haussy, Lucibel Asia, vous parle du "Dynamic lighting".

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Information about LUX REVIEW - Charles D'Haussy, Lucibel Asia, vous parle du "Dynamic...

Published on February 20, 2014

Author: DelLclair



Lux Review, 1er magazine Européen de l'éclairage, publie l'article de Charles D'Haussy sur le dynamic lighting, et du potentiel de la LED.

The dynamic potential of LEDs LED technology offers us exciting new ways to use light to promote health and wellbeing. The industry must embrace them. LED lighting is a unique platform for innovation. It addresses many challenges, including two that are particularly important for providing safe, comfortable light. Photobiological safety in lighting is outlined in the IEC/EN 62471 standard, which Celma (the European federation of lighting industry associations) recommends its members follow. IEC/EN 62471 provides guidance for evaluating how hazardous light exposure can be to the eyes and skin of different people. The spectral range over which radiance should be considered is 300-1400 nm, since the retina is essentially protected outside this range. And LED light sources are no exception. Nowadays designers and system integrators pretty much incorporate this requirement, but it’s critical to keep education efforts up, especially when it comes to end user health and safety Besides safety, a lighting design should be in line with our bodies’ natural cycles, to let the whole value of modern lighting be realised. All life on earth evolved in an environment ruled by cycles – such as the daily cycles of light and dark, and the seasonal cycles that move our weather from warm to cold. You might imagine that our sophisticated and complex modern life means we are no longer influenced by these cycles. And yet our biological cycles are regulated by external factors such as light. Human rhythms showing recurrent daily changes are known as circadian rhythms. These are human biological clocks, marking moments for sleep, waking, and socialising. Light sets, resets and adjusts the body clock of everyone of us. This means biologically effective light must take into account colour temperature, illuminance, light direction and adaptability. Volume 3 / Issue 1 / 2014 /

The colour temperature of daylight varies dynamically from sunrise to sunset. Numerous studies have demonstrated that exposure to light at night-time suppresses the production of melatonin, the hormone that controls our sleep and wake cycles. It is well established that short-wavelength blue light is the most melatonin-suppressive. LEDs are distinctly flexible. From the blue-white of the semiconductor component to yellow and red hues of the phosphor, the spectrum of colours that can be produced is remarkable. That’s another feature we can exploit. Understanding the light waves and colour delivered and their timeline becomes critical in lighting design for office workers, shoppers or restaurant customers. Studies show that illuminance levels between 500 and 1500lx are biologically compelling. Light control systems and sensors allow lux levels to be adjusted through the day. The human eye is used to receiving light from above. At the conception stages, we should focus on mimicking the flow and behaviour of natural light. Adjusting angles and positioning the lights become critical. Room decorations, including the colours of floors and walls, should be considered in order not to spoil the intended effect. Large luminaires tend to work best at reproducing natural outdoor light. With this in mind, biologically effective lighting designs can be fine-tuned so that they are not noticed, because they fit in so well with visitors’ body clocks. Dynamic lighting initiatives are already underway. Thanks to intelligent controls and sensors, luminaires can be separately controlled and adjusted to support our natural biological circadian rhythms. Projects delivered in elderly homes showed improvements in wellness and sociability. In schools, thanks to adaptive and dynamic lighting solutions, students show longer periods of concentration and better results. Circadian cycles and illuminance are much more connected than they appear at first glance. The correct lighting at the correct time not only makes individuals more alert but also makes them more motivated and productive, and improves social lives. Dynamic lighting experience has to be the ultimate target of all our solutions and designs. Our industry should leverage all its capabilities and technological innovations to promote a dynamic, biologically efficient lighting experience. Accomplishing this mission will make lighting a central point of our lives again. LED lighting, in its hardware and software forms, is a platform for interactions and services that support our wellbeing. Volume 3 / Issue 1 / 2014 /

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