Lighting : Lighting August 2015 - Vol 35 Issue 4
August/September 2015 | LIGHTING MAGAZINE 29 28 LIGHTING MAGAZINE | August/September 2015 3. What impact does façade lighting have on the environment and nature? Façade lighting has the potential to be the most obtrusive form of lighting and cause the most disruption to the environment and nature. Poorly designed façade lighting designs can produce a considerable amount of upward spill light contributing to unwanted sky glow that is evident in most urban environments. This can be countered through more precise methods of location and aiming of luminaires. A key factor in my recent facade lighting projects was to increase the quantity of luminaires while reducing the wattage and lumen output, overall this allowed us to direct and contain the light to the desired areas and reduce the extent of wasted upward light. Designs must take in to account the local environment and how the lighting scheme could cause potential negative impacts. The migration movements of certain animals can be affected through over-illumination and the use of certain lamp source colours, so these must be key considerations when developing any façade lighting scheme. 4. What lighting project are you most proud of and why? I find that every project I complete brings a certain level of pride and accomplishment, but I generally find my greatest satisfaction comes from certain lighting elements within an overall design. I recently completed the installation of a design into a new hotel lobby and overall the result was great, but it was the hero element within the project that brought me the most happiness. It was a simple installation of a wall grazing luminaire across a 3d panelled wall, but through several mock-ups and renders we were able to select the most effective lighting element. The budget really restricted the project, but investing in the correct luminaire to this area provided a layer of lighting that lifted the whole space. I think that even the simplest concepts of lighting design can be ruined if the time and effort is not invested into ensuring it can reach its full potential. DesignerQ&A 5. 2015 is the International Year of Light, could you tell us what this means to you as a lighting professional? So far I think the most positive element to come out of this has been the extent of coverage in mainstream media and the level it has penetrated into the minds of the general public. It has really brought to attention the importance of lighting in our day to day lives and provided some great topical debate into the positives and negatives of lighting within society and our environment. There has been some great exposure to the impact lighting has to the quality of life, and how it is a key component to improving the lives of people within developing nations who have previously not had access to such a luxury. It has also served caution too developed countries about the dangers of excessive indulgence in lighting, making aware the negative impacts of light pollution, excessive energy consumption and the environmental impacts caused by poor design and inferior technology. These issues have been in the minds of most in the lighting industry for years, and to see it being presented to the public in an open and engaging platform is great for the industry and also society as a whole. The design and aesthetics of lighting is always at the paramount of the designers mind, but we must be conscious to the impact in which we interact our lighting art into environment, and I believe there has been some great progression this year in understanding these responsibilities. Sorting out the basis of general lighting practice* By Kit Cuttle For those of us who feel concerned about lighting design, the current situation in general lighting practice is utterly dismal. When we are fortunate enough to encounter an enlightened building owner, it is to be expected that their concerns will focus on sustainability issues, and, particularly if there are consultants involved who are anxious to avoid professional liability repercussions, it is entirely reasonable to expect that they will want the lighting to be fully compliant with current lighting standards. The AS/NZS 1680 series for Interior and Workplace lighting specifies requirements in terms of minimum illuminance levels to be provided on task planes, but these planes are not specifically defined with the result that practical application requires the prescribed levels to be provided uniformly over wall-to-wall horizontal working planes. This effectively makes thoughtful application of illumination distributions to provide for lighting design objectives impossible. It needs to be understood that this situation is not restricted to working environments. TECHNICAL FEATURE For any location where the standard prescribes an illuminance value, for an installation to be accepted as fully compliant it will have to be just another regular array of luminaires providing uniform horizontal working plane illuminance. You can forget any thoughts about lighting that relates to the actual situation, let alone any imaginative or creative solutions. My recently published book, Lighting design: A perception-based approach1, proposes an alternative approach which involves redrafting lighting standards in terms of ambient illumination levels. The difference here is that ambient illumination is specified in terms of mean room surface exitance, MRSE, which is the measure of the density of inter-reflected luminous flux within the volume of an enclosed space. Note that this metric does not include direct flux: it concerns only flux that has undergone one or more reflections from surrounding room surfaces. If indoor lighting standards were to be specified in MRSE, then in all cases (not just high-budget, potential award- winning projects), designers would have freedom to devise lighting design objectives to suit whatever situation is on hand. While technicians who know nothing about lighting would still be able to churn out standards- compliant luminaire layouts, MRSE- based standards would open up opportunities for designers who recognise the potentials that lighting offers to devise lighting distributions ... these planes are not specifically defined with the result that practical application requires the prescribed levels to be provided uniformly over wall-to-wall horizontal working planes.
Lighting June 2015 - Vol 35 Issue 3
Lighting October 2015 - Vol 35 Issue 5