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