Lighting : LIGHTING-June-July-2017
mirror the intensity, timing, colour and dynamics of natural light. HCL can supplement natural daylight. Where HCL can deliver the aforementioned benefits, on the flipside, it is also conceivable that light can have similar negative effects when used incorrectly. Application example: Cool light with high intensity will support people waking up in the morning and warm light with low intensity will support people to go to sleep. When using cool light with high intensity in the evening this will prevent people from going to sleep smoothly. With the intention to achieve the desired beneficial effects and avoid negative effects, HCL solutions need to be based on an integrative lighting design. LightingEurope recommends to have this realized by a knowledgeable lighting designer. HCL is aimed at providing the right light for our activities at the right place at the right time. Proper use of the terminology LightingEurope acknowledges, that in many applications lighting designers have realized adequate HCL solutions, before this term was created and the understanding expressed in this position paper has been developed. Now, as with many new things, the terminology HCL is sometimes used in an improper way. Descriptions such as “our lighting is made by humans”, “our light is used by humans” or “we produce already 10/25/100years light designed for people” are not the type of claims that are considered HCL. Also, the pure technological feasibility to tune lighting in colour or intensity is not automatically providing a HCL solution. In order to promote an appropriate use of the term HCL, LightingEurope recommends that the promised benefits thereof are backed by scientific user-based evidence relevant for that specific proposition in that specific application which will typically require a dedicated design process.
LIGHTING August-September 2017