LIGHTING PLANS Lighting Design, Impact Assessments, and Avoidance of - PDF document

19/11/2019 LIGHTING PLANS Lighting Design, Impact Assessments, and Avoidance of Impacts to Bats Presented by Bonnie Brooks BA(Hons) BEng (Hons) MSc CEng MSLL MCIBSE 1 Bonnie Brooks BA(Hons) BEng (Hons) MSc CEng MSLL MCIBSE MILP Lighting Consultant (Chartered Electrical Engineer and Lighting Designer) • 14 years experience in electrical & lighting engineering • MSc Light and Lighting with Distinction • Undertakes interior, exterior, street lighting, daylighting design • First Class BEng (Hons) Building • Specialist in Lighting Impact Assessments Services Engineering • Interested in effects of not only lighting on wildlife and environment, but also on human health and well being • 18th Edition Update 2382-20 • Involved in provision of various guidance documents such BCT ILP Bats and • 2391 Level 3 Inspection, Testing and Artificial Lighting, Bath Enterprise Zone, Guidance on Undertaking Lighting Impact Assessments Certification of Electrical Installations • Actively involved in industry- regional rep for Society of Light and Lighting • JIB Qualified Electrician • NVQ Level 3 Advanced Modern • Won a number of awards associated with her BEng and MSc Apprenticeship in Electrotechnical Services • Presented at various symposiums and events including Nocturnal landscapes • BA (Hons) Design Conference, Wildlife and Artificial Light Symposium www.illume-design.co.uk | info@illume-design.co.uk 2 1

19/11/2019 Lighting Terminology Section presented by Bonnie Brooks BA(Hons) BEng (Hons) MSc CEng MSLL MCIBSE MILP 3 Lighting Terminology Amount of light flowing or given off in a particular direction, from a surface or a source (sometimes referred to as objective brightness/not apparent brightness) Dependent on observer location Light falling onto a surface www.illume-design.co.uk | info@illume-design.co.uk 4 2

19/11/2019 Typical Illuminance Levels www.illume-design.co.uk | info@illume-design.co.uk 5 Colour Temperature- measured in Kelvin (K) www.illume-design.co.uk | info@illume-design.co.uk 6 3

19/11/2019 Specify LED light sources: Light sources with different wavelength • Minimal UV compositions. • With a warm colour - Impacts on colour temperature – 3000K or 2700K temperature and colour rendering. • Light sources that peak higher than 550nm www.illume-design.co.uk | info@illume-design.co.uk 7 Lighting Plans Section presented by Bonnie Brooks BA(Hons) BEng (Hons) MSc CEng MSLL MCIBSE MILP 8 4

19/11/2019 Lighting Plans • Lighting Strategy / Plan – typically shows luminaire locations, specification, details on controls • May include a lux contour plan/ isolines to show predicted levels of illuminance / light spread at ground level • Lux contours should be shown on a scaled site layout- not raw output from lighting software! • It is useful if the plan also shows the required dark zones (primary, secondary, buffer zones, roost access points)- hatched and overlaid www.illume-design.co.uk | info@illume-design.co.uk 9 Lighting Strategy with Isolines shown www.illume-design.co.uk | info@illume-design.co.uk 10 5

19/11/2019 Raw output examples www.illume-design.co.uk | info@illume-design.co.uk 11 Lighting Plans • Lighting software is used to predict the output from light sources. Calculation planes are added to understand lighting levels in certain areas. • A calculation plane is made up of a grid of calculation points. • The location of the calc. planes can match real surfaces/topography or be in the air, at any angle or direction. • Maintenance Factor should be 1 for assessment purposes (Software sometimes uses different names: Light loss factor, correction factor) • Average illuminance (Eav) • Maximum and Minimum point illuminance (Emax, Emin) Terms to understand • Uniformity (Uo) – min/ave, min/max • Upward Light Output Ratio (ULOR /ULR) www.illume-design.co.uk | info@illume-design.co.uk 12 6

19/11/2019 Lighting Measurements and Calculations www.illume-design.co.uk | info@illume-design.co.uk 13 Lighting Terminology Calculation planes explained Horizontal calculation plane at ground level www.illume-design.co.uk | info@illume-design.co.uk 14 7

19/11/2019 • Illuminance is calculated falling onto one side of the calculation surface • For horizontal planes isoline contours can be shown on a 2D plan Vertical calculation • Values of illuminance can be shown in plane table format for the vertical planes Reflected light Reflected light Horizontal calculation plane at ground level www.illume-design.co.uk | info@illume-design.co.uk 15 • Will only show light falling on top of the plane, so light emitted below is not captured Horizontal calculation planes at varying heights can be mis-leading!! Calculation planes only measure on one side! Horizontal calculation plane at ground level www.illume-design.co.uk | info@illume-design.co.uk 16 8

19/11/2019 Lighting Plans • Vertical planes are required when: • Internal light spill is to be considered • Luminaires are not 100% downward directional • Where light levels proposed are particularly high, such as sports pitches • When vertical calculation planes are required – request a key plan to show the locations of those planes, and details of their heights • When internal lighting is calculated, ideally an accompanying Lighting Impact Assessment report should be provided detailing the assumptions and limitations of the calculation model, if topography is included, if screening/ buildings is included, glazing transmittances used, lighting levels and types used, mitigation measures, confirmation of worst case- all lights on, no blinds and curtains, summarising the results, backed up with evidence in an Appendix www.illume-design.co.uk | info@illume-design.co.uk 17 www.illume-design.co.uk | info@illume-design.co.uk 18 9

19/11/2019 Limiting luminance – bright visible sources that may create a barrier • Downward directional luminaires where light source is not visible – also limits light spill • No lit surfaces, signage, façade lighting Check ULOR value for luminaire www.illume-design.co.uk | info@illume-design.co.uk 19 Post Installation/ Monitoring checks • Recommended that light levels are verified by a competent lighting professional with an industry standard illuminance (light) meter, that is calibrated to low light levels • (Baseline survey may be required as a comparison.) • Report to include: Time and date of the post monitoring survey o o Moon phase and weather conditions at time of survey o Details of the illuminance meter used and calibration details A short description of the survey method o A table of results detailing each numbered survey location, associated GPS o coordinates of each location, and results for vertical and horizontal illuminance Note: Lux contour plans cannot be produced for Baseline or Post-Monitoring surveys www.illume-design.co.uk | info@illume-design.co.uk 20 10

19/11/2019 Thank you Any questions? Please connect with us on LinkedIn and visit our website for the latest news and updates www.illume-design.co.uk | info@illume-design.co.uk 21 11