How do you know if you’re using the most energy efficient street lighting?

Nick Smith IEng MILP MIESManaging Director - Nick Smith Associates LtdTechnical Director – Lighting Reality

The Design Process• Choose a class• Choose a Luminaire

– Wattage– Lens setting– Lumen package– Drive current

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The Design Process

1. Select benchmark lighting class from table2. Do Risk Assessment & refer local policy3. Adjust target level based on specific risks4. Adjust target level for “white” light5. Look at variable lighting options

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Taken from BS5489

Table A5: Lighting classes for subsidiary roads with a typical speed of main user v ≤ 30 mph

Traffic Flow

Lighting class

Ambient luminance

Very Low (E1)

Low (E2)

Moderate (E3)

High (E4)

Busy S3 or P3 S3 or P3 S2 or P2 S2 or P2

Normal S4 or P4 S4 or P4 S3 or P3 S3 or P3

Quiet S5 or P5 S5 or P5 S4 or P4 S4 or P4

The Design Process

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P class Photopic illuminance (lux) for Ra<60

Photopic illuminance (lux) for Ra ≥60 according to S/P ratio of lamp

0.23 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8

P1 15.0 15.0 14.3 14.0 13.7 13.4 13.1 12.8 12.6 12.3 12.1 11.8 11.6 11.4

P2 10.0 10.0 9.4 9.1 8.9 8.6 8.4 8.1 7.9 7.7 7.5 7.3 7.2 7.0

P3 7.5 7.5 7.0 6.7 6.5 6.3 6.0 5.9 5.7 5.5 5.3 5.2 5.0 4.9

P4 5.0 5.0 4.5 4.3 4.1 4.0 3.8 3.7 3.5 3.4 3.3 3.2 3.1 3.0

P5 3.0 3.0 2.6 2.5 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.7 1.6 1.6

P6 2.0 2.0 1.7 1.6 1.5 1.4 1.3 1.2 1.2 1.1 1.0 1.0 0.9 0.9

These values provide equal mesopic illuminance according to CIE recommended system for mesopic photometry assuming a surface reflectance of 0.07.

LPS or HPS lamp

S/P ratio and illuminance when Ra ≥60

Lamp with:S/P ratio = 1.2 Ra ≥60

Lamp with:S/P ratio = 2.0 Ra ≥60

ILP PLG03

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The Design Process

Using Lighting design software to determine the right luminaire option

www.Agi32.comwww.lightingreality.com

www.dialux.com

www.relux.com

www.visual-3d.com/www.Autolux.us

Or Manufacturer specific program

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EN 13201‐5:2015

• Power Density Calculation– Watts / lux / m2

– Power density indicator for an area divided into sub‐areas for a given state of operation shall be calculated

– Consider variable spacing and levels– Why do we need it?

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BS EN 13201‐5

• AECI – Energy Consumption Indicator– kWh/m2

• The annual electricity consumption of a road lighting installation depends on– the period of time for which lighting is provided,– the lighting class specified by the relevant lighting standard for each 

lighting period,– the efficiency of the lighting installation, when providing the necessary 

lighting for each period,– the way the lighting management system follows the change in visual 

needs of road users,– the parasitic energy consumption of lighting devices during the period 

when the lighting is not needed.

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Another way to consider

www.ace.lighting

#From the developers of Lighting Reality

What is ACE

• Cloud based luminaire Intelligence tool– Because it is Cloud based

• Not device or machine specific• Not operating system specific

– Windows, Desktop or Windows Mobile» Desktop» Laptop» Tablet

– Apple OS– Mobile Apple IOS

» Ipad, or Iphone (If the screen is not too small)– Android

» Tablet, or Phone (If the screen is not too small)#

You log in to the software

ACE Architecture

Data StorePhotometry

Data

Scenarios

Results

Work Queue

PhotometryManager

ScenarioGenerator

Data Export

SalesApplication

EvaluatorApplication

3rd PartyApplicationsACE

Engine

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What is ACE‐Stage 1

• Upload Photometric data– IES, LDT, CIB or INR– Tagging essential

• Application• Manufacturer• Product Name• Body size• Light Source• Colour temperature

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What is ACE‐Stage 1

– Pre process data and extract metadata• Lumen package• Wattage• Lamp information• Optic setting• S/P Ratio• Drive Current• Prepare Polar curve / Cartesian curve

– Data is stored in a database, I will come back to this.

ACE Architecture

Data StorePhotometry

Data

Scenarios

Results

Work Queue

PhotometryManager

ScenarioGenerator

Data Export

SalesApplication

EvaluatorApplication

3rd PartyApplicationsACE

Engine

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Tagging

What is ACE‐Stage 2

Additional standards due shortly.Australian and New Zealand 1158 classes P and V

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What is ACE‐Stage 2

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What is ACE‐Stage 2

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Tagging

What is ACE‐Stage 2

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What is ACE‐Stage 2

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ACE Architecture-Stage 3

Data StorePhotometry

Data

Scenarios

Results

Work Queue

PhotometryManager

ScenarioGenerator

Data Export

SalesApplication

EvaluatorApplication

3rd PartyApplicationsACE

Engine

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What is ACE‐Stage 3

• You go home• Calculations queued & automatically processed in the Cloud • ACE Engines are created dynamically on demand• Allows rapid scaling to meet calculation demand• Equivalent calculation power to 100’s of computers in your 

office• Ace app will calculate scenarios in the cloud using as many 

machines necessary to return the results in a reasonable time.• Data added to a unique SQL database

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ACE Architecture-Stage 3

Data StorePhotometry

Data

Scenarios

Results

Work Queue

PhotometryManager

ScenarioGenerator

Data Export

SalesApplication

EvaluatorApplication

3rd PartyApplicationsACE

Engine

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SQL database

What is ACE‐Stage 3

• Calculation outputs– Max Spacing– Min spacing (for P classes)– All quality figures (Average, Min, Max, Min / Ave etc)– Luminaire wattage

• (Assuming it is has been entered into the photometric file)

– Power Density– Annual Energy Consumption Indictor

• Data added to a unique SQL database

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What is ACE‐Stage 4

• 4 output options– Data can be exported as an Excel spreadsheet via the exporter• All data• Specific data (perhaps for a tender)

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What is ACE‐Stage 4

What is ACE‐Stage 4

• 4 output options– Data can be exported as an Excel spreadsheet via the exporter• All data• Specific data (perhaps for a tender)

– Sales App can access the same data to filter the results based on• Spacing• Wattage• Source Flux

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What is ACE‐Stage 4

What is ACE‐Stage 4

• 4 output options– Data can be exported as an Excel spreadsheet via the exporter• All data• Specific data (perhaps for a tender)

– Sales App can access the same data to filter the results based on• Spacing• Wattage• Source Flux

– Evaluator Application– 3rd Party Applications (import data to you own SAP system)

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Finally• The future is still bright 

– (depending what Class you choose)• but a not really        • With many 

– Luminaires– wattage, – lumen outputs and – lens settings to choose from   

• But you have a new tool to find the most energy efficient solution

• THANK YOU#

Steadfast and loyal

www.ace.lightingFrom the developers of Lighting Reality