PLS 2016: The business case for LED street lighting
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Transcript of PLS 2016: The business case for LED street lighting
The Business Case for LED Lighting
Alistair Scott BSc, CEng, FILPPast President Institution of Lighting Professionals
Managing Director Designs for Lighting LtdChairman BSI EL/001/02 Road Lighting
The business case for LED street lighting
Essential questions to be answered…1. Reasons for Lighting2. Benefits of LED Lighting3. 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
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?
LED’s will last 20 years
Maintenance Free
200 lumens / watt
Dangerous for health
LED’s are 100% efficient
80% energy savings
Benefits of LED lighting• Provide significant energy savings• Reduced CO2 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
the right light in the right place at the right time consuming the minimum amount of electrical energy
Intelligent Management of Public Lighting
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. Energy Management2. Competency 3. Risk Assessments4. Environment5. Health & Safety
• Variable Lighting• Trimming• Choice of Lighting Class• Choice of Colour Temperature• Efficient luminaire• Efficient design• Constant light output• Choice of running current
Energy Management
Energy ManagementAdaptive Lighting (or profiling)
TrimmingVariable LightingPart Night Lighting
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 ManagementAdaptive Lighting (or profiling)
Risk Assessments
What are the risks?
• Visibility• Task complexity• Crime potential• Fear of Crime & Personal Safety
Energy ManagementAdaptive Lighting (or profiling)
• Variable Lighting• Trimming• Choice of Lighting Class• Choice of Colour Temperature• Efficient luminaire• Efficient design• Constant light output• Choice of running current
Energy Management
Energy Management
Colour Temperature
4100°K6500°K 3000°K 2400°K
Energy Management
CLO
= over-lighting
= energy saving
Operating hours (‘000s)
Light level (%)
Operating hours (‘000s)
Power Consumption(%)
LED Life & Maintenance Factors
00.10.20.30.40.50.60.70.80.9
1
L91 = 50,000 hours
L90 = 70,000 hours
L88 = 100,000 hours
Operating hours
Lumen Maintenance
LED Life
Do we need 20 years + life?
LED Luminaires
IET Good Practice Specification Template
IET Good Practice Specification Template
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
– Specification– Luminaire– CMS (Infrastructure + Annual hosting)– Installation– Design Costs
• Maintenance 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
Alistair Scott BSc, CEng, FILPPast President Institution of Lighting Professionals
Managing Director Designs for Lighting LtdChairman BSI EL/001/02 Road Lighting
Thank you