Good lighting design must serve the needs of the users and meet the requirements of all external parties


the past ten years, many countries have developed recommendations for dealing with light pollution. Whilst these are all largely in agreement as to how to tackle the problem, the actual values recommended do differ according to local expectations of what is tolerable. Two industry recognised publications which provide a degree of guidance for the reduction of light pollution are the CIE 150:200 ‘Guide on the Limitation of the Effects of Obtrusive Light from Outdoor Lighting Installations’ and the ILE’s ‘Guidance Notes for the Reduction of Light Pollution’.


Possible solutions


Good lighting design must serve the needs of the users and meet the appropriate requirements of all external parties, who experience the lighting. The lighting designer will consider the most appropriate floodlighting equipment, column height and column locations in order to limit the amount of light pollution.


FLOODLIGHTS


In general, the floodlights that will produce the most efficient lighting system for a given specification will also be those that effectively control spill or stray light as a they concentrate a higher percentage of their light directly onto the target area - the sports field. These types of lighting systems tend to be specifically designed for sporting applications, where the performance of the reflector system, luminaire, lamp and control gear are optimally matched by the manufacturer to produce far higher performance than that of general floodlights. Just as light spill is a key issue during evening games, so too is the issue of conspicuous masts,


which can visually spoil the daytime aesthetic.


CORRECT LOCATION


The lighting designer should define the best performance possible to balance all needs, and to verify by measurement that the installed system is correctly aimed to deliver the intended results. Installation has to be done, therefore, in close cooperation with the installing contractor to ensure that the columns are placed in the correct position and that all floodlights are aimed and tilted to the intended design positions for optimal performance. Large ‘protractor - scale’ angle indicators at either side of the floodlight, or a simple aiming device, permits accurate aiming.


MAINTENANCE Once correctly installed,


consideration also has to be given to the lamp replacement without compromising the original aiming position of the floodlight.


Solutions for dealing with or avoiding light pollution concern more than just the proper choice of lighting equipment. All those involved, from town planners to the final


users, have a part to play, and always with the


sensitivities of the local


community in mind.


Philips vision


One such example of reduced spill and spray is the OptiVision ‘flat glass’ asymmetric floodlight, available from Philips, which produces approximately three times less spill light than previous asymmetric floodlights. It has a patented reflector system which delivers its highest peak lighting intensity at 60 degrees from the vertical and an excellent cut-off at 80 degrees from the horizontal while in a flat glass position.


By designing very compact reflector optics around the double- ended 2kW lamp and oversized fins for optimal cooling, Philips has succeeded in making OptiVision smaller and more compact than comparable 2kW floodlights. This compact size together with the OptiVision’s low weight, windage and versatile mounting options also allows for less visually obtrusive columns to be designed.


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