The Business Case for LED Lighting Alistair Scott

The Business Case for LED Lighting Alistair Scott BSc, CEng, FILP Past President Institution of Lighting Professionals Managing Director Designs for Lighting Ltd Chairman BSI EL/001/02 Road Lighting

The business case for LED street lighting Essential questions to be answered… 1. Reasons for Lighting 2. Benefits of LED Lighting 3. Standards & Guidance for Lighting 4. Road Lighting Best Practice – – – Is the Specification fit for purpose? Is the lighting quality equal to the existing Are the warranties necessary or meaningful? Are predicted energy savings reliable Is the inventory reliable? Is the existing infrastructure structurally sound?

Reasons for Road Lighting is installed to: • • Provide visual guidance Reveal obstacles Provide visual clues Allow pedestrians to see hazards Allow pedestrians to orientate themselves Allow pedestrians to recognise others Provide a feeling of security and safety

What can we believe? Maintenance Free 80% energy savings Dangerous for health LED’s are 100% efficient LED’s will last 20 years 200 lumens / watt

Benefits of LED lighting • • • Provide significant energy savings Reduced CO 2 emissions Robust to deal with fluctuating power Emit no UV Variable output – easily controlled Point Source – Controllable light distribution Reduced light spill Long Life Reduced Maintenance Improved Safety Good Colour Rendering Colour stability / Choice of colour temperature

Specification – Lighting Standards

Intelligent Management of Public Lighting the right light in the right place at the right time consuming the minimum amount of electrical energy

Design Considerations • • Lighting Class or “best fit” Effect of glare Potential for obtrusive light Energy demands Whole life cycle costs Risk Assessment Management & Control CDM

BS 5489 Key Themes 1. 2. 3. 4. 5. Energy Management Competency Risk Assessments Environment Health & Safety

Energy Management • • Variable Lighting Trimming Choice of Lighting Class Choice of Colour Temperature Efficient luminaire Efficient design Constant light output Choice of running current

Energy Management Adaptive Lighting (or profiling) Trimming Variable Lighting Part Night Lighting

Energy Management Adaptive Lighting (or profiling) Does usage vary significantly through night? e. g rush hour, last orders etc. Do other parameters change? Build up light profile Use ILP guidance

Energy Management Adaptive Lighting (or profiling) Risk Assessments What are the risks? • • Visibility Task complexity Crime potential Fear of Crime & Personal Safety

Energy Management • • Variable Lighting Trimming Choice of Lighting Class Choice of Colour Temperature Efficient luminaire Efficient design Constant light output Choice of running current

Energy Management Colour Temperature 6500°K 4100°K 3000°K 2400°K

Light level (%) Energy Management CLO Power Consumption (%) Operating hours (‘ 000 s) = over-lighting = energy saving Operating hours (‘ 000 s)

LED Life & Maintenance Factors Lumen Maintenance 1 0. 9 0. 8 0. 7 0. 6 0. 5 0. 4 0. 3 0. 2 0. 1 0 L 91 = 50, 000 hours L 90 = 70, 000 hours L 88 = 100, 000 hours 00 00 12 00 00 11 00 00 10 0 00 90 0 00 80 0 00 70 0 00 60 0 00 50 0 00 40 0 00 30 0 00 20 0 00 10 0 Operating hours

LED Life Do we need 20 years + life?

LED Luminaires

IET Good Practice Specification Template

Specification Issues – Weight & Windage

Specification – CMS • • • More flexibility to adapt light levels Potential for optimising design to achieve energy reduction Incorporate other sensors Reduce scouting More efficient Maintenance Efficient management and reporting

Business Case

Business Case • Capital Cost – – – • Maintenance Costs – – – • • • Specification Luminaire CMS (Infrastructure + Annual hosting) Installation Design Costs Electrical Testing Column Testing Scouting (Reduced) Cleaning & Bulk lamp change (Reduced) Reactive Maintenance (Reduced) Energy Costs Third Party Revenue Pay Back

Business Case Toolkit

Business Case Requirements • Robust lighting strategy • Robust accurate inventory • Asset Management System • Column Replacement Strategy • Financial modelling

The Business Case for LED Lighting Thank you Alistair Scott BSc, CEng, FILP Past President Institution of Lighting Professionals Managing Director Designs for Lighting Ltd Chairman BSI EL/001/02 Road Lighting