PLS 2019: How to overcome the challenge of lighting sensitive natural environments
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Lighting to protect the environment is a complex practise with an ever-expanding range of technologies available to lighting designers. There is also increasing legislation and policy to meet as our understanding of the adverse effects of artificial lighting grows. This presentation explored some of challenges faced when designing lighting installations in sensitive environments including how lighting strategies are key to minimising the effects and impacts of artificial lighting on sensitive receptors such as bats, other fauna and residential observers and where the effect of light would be detrimental to the dark sky. The resentation included a case study for a project that has recently been granted a ‘Good lighting’ award by the Commission for Dark Skies. This talk is helpful to exterior lighting designers, project managers, local authorities, environmental and street lighting engineers. by Ryan Carroll, Designs for Lighting
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PLS 2019: How to overcome the challenge of lighting sensitive natural environments
- 1. Designs for Lighting Ltd Presented by: Ryan Carroll BSC IEng MILP Contact: ryan@designsforlighting.co.uk | T: 01962 855080 | M: 07765 575677
- 2. The Challenge The Client Constraints Lighting Strategy The Result Development Contents
- 3. Dorothy House Hospice Care Winsley Bradford- on- Avon, Wiltshire The site - Agricultural land within the site boundary (to be used for car parking purposes) The Client The Client
- 4. To provide lighting for the proposed car park extension, ensuring that sensitive ecology on the boundaries was not impacted. The Challenge The Challenge
- 5. To provide a lighting assessment for the proposed car park extension. The Challenge The Brief
- 6. To provide a sensitive lighting solution for the existing and proposed car park. The Challenge The Opportunity
- 7. Constraints Constraints Cotswolds AONB Winsley Mines SSSI within 1km of the site Within an SAC Nearby sensitive residential amenity
- 8. Benefits of the early involvement of a lighting consultant Lighting Strategy Lighting Consultant Landscape Architect Ecologist Planning Consultant Consultant Team Structure Dorothy House
- 10. Ensure sensitivity to the ecology receptors and dark sky within the lighting design. The lighting strategy will support the development in the long run, as any maintenance if required will need to comply with the lighting strategy. Lighting Strategy DevelopmentLighting Strategy
- 11. Lighting Strategy A baseline lighting survey was undertaken to establish the existing light levels on site and assess existing light spill. DevelopmentLighting Strategy
- 12. Luminaire performance parameters were determined and written into the lighting strategy to ensure that the installation would comply with Guidance Notes for the Reduction of Obtrusive Light (GN01), now and throughout the life of the installation. Lighting Strategy DevelopmentLighting Strategy
- 13. Zonal lighting approach splitting existing and proposed car park into two sections. Compromise Development
- 14. Existing car park control to remain (photocell control from dusk, PIR control from 10:00pm until dawn). Development Compromise
- 15. Proposed car park to have multiple phase control system comprising of photocell control from dusk until 6:00pm, Manually activated time delay switch 6:00pm until 10:00pm, Illuminated bollards only after 10:00pm. Development Compromise
- 16. Illuminated bollards provide way finding lighting only between 10:00pm and dawn. Development Compromise Controls Column Lighting Existing & Proposed Car Park Extension & Ramp Lighting Type Existing Car Park Solar time clock: Dusk-22:00 hrs PIR Sensor from 22:00 hrs Proposed Car Park Extension Solar clock Dawn-18:00 hrs Time delay switch 18:00-22:00 hrs 22:00-06:00 hrs not operational Bollard Lighting Proposed Car Park Extension & Ramp Only Solar time clock Dusk – 18:00 Time delay switch operated From 18:00–Dawn Performance Requirements
- 17. Development Lighting Approach BS EN 12464-2:2014 Table 5.9 Traffic flow est. Light Site constrains (AONB, SAC, SSSI, E1 Zone) Eav 5.0 Lux too high for proposed extension due to bats commuting / foraging roosting within hedgerow. Ecologist requests no lighting BS 5489-1:201 - The purpose of lighting car parks is to enable all users, including motorists and pedestrians, to proceed safely, and to allay the fear of crime. Table 5 light traffic Eav = 5.0 lux Still too high for ecological receptors Apply ‘P’ Lighting Class with S/P Ratio [Table A6 and A7] Ecologist agrees in principle if boundary hedge rows = ≤0.5 lux (max)
- 18. Lighting Standards The speed limit of the car park restricted to 5mph. New travel plan encourages car park extension to be filled first, emptied first. i.e .Staff use mainly. E1 Environmental zone quiet traffic flow. Apply P6 lighting class. Development Use 3000K Warm white light output to reduce potential effects from blue wavelength rich sources on ecology Apply S/P Ratio of 1.3
- 19. Lighting Standards Proposed lighting will need to comply with Institution of Lighting Professional’s Guidance Notes for the Reduction of Obtrusive Light (GN01:2011) E1 Environmental Zone Development
- 20. Indicative Lighting Layouts An indicative lighting layout was provided for the purposes of validating the lighting strategy. Indicative lighting layout also allowed project ecologist to scrutinise and comment on. Development
- 21. During the design process, we liaised with the manufacturer to develop a bespoke shield solution to ensure the light spill achieved 0.5 lux at the sensitive boundaries. Development Collaboration with Manufacturers
- 22. Planning Permission Granted in 2017 and we completed the finalised design in 2018. This included: The Installation was completed in January 2019. Shortly after the completion of the scheme the Commission for Dark – Skies awarded Dorothy House Hospice a ‘Good Lighting Award’. Development • Finalising the lighting specification; • Designing the electrical system; • Liaising with the contractor and client team;
- 23. The Installation was completed in January 2019. Shortly after the completion of the scheme the Commission for Dark – Skies awarded Dorothy House Hospice a ‘Good Lighting Award’. Development Planning Permission
- 24. This was awarded following an assessment of the lighting by the Commission for Dark Skies, who considered it to be an exemplar scheme for minimising the impact of lighting on the Dark Sky. Development Planning Permission
- 27. Designs for Lighting Ltd Presented by: Ryan Carroll BSC IEng MILP Contact: ryan@designsforlighting.co.uk | T: 01962 855080 | M: 07765 575677