Saving Energy and Improving Light Quality in Street Lighting

Saving Energy and Improving Light Quality in Street Lighting P K Mukherjee and Amit Khare, CLASP ELCOMA LED Lighting Workshop Bangalore, 16 May, 2013 Applications of the SEAD Street Lighting Tool

Agenda • Street Lighting Tool - Benefits and Features • Case Study • Future Directions for the Tool • Tool Use in India

SEAD Street Lighting ToolFeatures & Benefits

This tool is used to help purchaser of street Lighting fixture : To carry out Techno-Commercial evaluation between Traditional Technology & Emerging Technology

Example use: For LED fixtures,performance is more than • wattage and light distribution! SEAD Street Lighting Tool helps with proper fixture selection for performance and energy savings

Not intended to replace professional lighting design software but a tool to carry out analysis between lighting quality & energy uses of multiple fixtures

This tool is designed to provide a simple, easy way of doing detailed street lighting photometric analysis. Whether you're ……. An experienced designer, A procurement official looking to verify manufacturer claims, Policy person wanting to know the magnitude of potential energy savings,

SEAD Street Lighting Tool Features • Simplified photometric analysis • Integrated energy and life cycle cost analysis • Faster pre-screening process Allows quick short-listing of candidate fixtures for the specific upgrade.

SEAD Street Lighting Tool Overview • Free software for analyzing • energy use; • light quality; • and lifecycle costs for roadway lighting fixtures. • The tool can be used for: • Batch analysis of fixtures for retrofits • early stage design evaluation • Introduction to photometric analysis for novice users

SEAD Street Lighting Tool Overview • Compatible with Microsoft Excel 2003 and later versions • Available in English, French and Spanish • Can support additional languages if partners can help with translation • Download the latest version directly from: www.superefficient.org/sltool

Tool Approach Simplified Road Configuration Only straight roads, no intersections or sloped roads, and even pole spacing. Simplifying the road calculations speeds up the analysis process. 1) Target Light Levels Identifying minimum light level targets allows the tool to filter fixtures by those that pass or fail the criteria. Illuminance and luminance both available. 2) Multiple fixtures Users can upload IES files, and then select as many as hundreds of fixtures for simultaneous analysis. 3) Life cycle cost Optionally, users can enter high-level cost estimates for fixture installation, maintenance, etc. The tool returns simple payback compared to a baseline and life cycle net present value estimates. 4)

How this helps with prescreening: • Simplified roads: Fast input of geometry • Multiple fixtures: Allows the initial calculations to do screening for you, rather than vetting each fixture individually first. • Integrated cost and energy analysis: allows you to evaluate trade-off with increased energy for improved light output. Simple payback and Net Present Value calculations both provided.

Comparison to Conventional Software

Sample Analysisof an Ontario municipality

The Road Layout Typical 4-lane arterial road (undisclosed location due to ongoing RFPQ process)

Single Side Arrangement Poles placed on one side of the road only Single Side Pole Placement Poles placed only on one side of the road S W S – Luminaire Spacing W – Road WidthRoad Width

Pole Height and Arm Length Arm Length Pole Height Mounting Height Angle of Tilt

Pole Spacing SPACING

Effect of Road Surface Same illuminance may result in different visual scene because of difference in road surface .

Luminance Working plane Luminance Reflection of Light

Uniformity It is not enough just to maintain the correct lighting level.Dark patches act as camouflage, making obstacles and hazards hard to make out or completely concealing them from view.

Results Analyzed performance for 300+ fixtures from 3 manufacturers

“1”- Number of Lamps • “-1” – For Absolute Photometry (-1 or luminaire lumen) but for Relative photometry Lamp lumen • “1.0”- Cd multiplying Factor • “19”- Number of C planes • “19”- Number of Gamma Angles • “1”- c -γ Photometry while 2 is used for B-β • “2” – Dimension are in meter while 1 for feet. • “0.200 0.240 0.000” luminaire dimension

Sample Cost Analysis Values are illustrative and approximate *LED fixture cost equation calculated from a limited set of sample fixture costs and should not be used for actual analysis.

Tool Implementation Plan • Demonstration Partnerships • Feedback on tool utility and features • Assurance to future users of tool capabilities • Tool Upgrades • Improved usability • Improved financial analysis • CIE calculations • Tool Dissemination • Informing potential users of the tool • Improved training and documentation • Additional Projects • Identification of other key barriers to SL installations • Considering additional projects to address barriers

SEAD Tool Demonstration Partnerships Partner Benefits Partner Responsibilities Collect data and conduct analysis using SEAD tool Have available staff members to implement the project Provide feedback to SEAD on their experience using the tool • Receive customized training sessions via teleconference, webinar, or on-site visits • Assistance conducting analysis • Potential to influence future tool upgrades

Contact sltoolkit@superefficient.org P.K. Mukherjee pkmukherjee@clasponline.org Amit Khare akhare@clasponline.org Download www.superefficient.org/sltool

Tool Validation Single-Sided Pole Placement HPS Fixture Staggered Pole Placement HPS Fixture

Tool Validation Single-Sided Pole Placement LED Fixture Staggered Pole Placement LED Fixture

Saving Energy and Improving Light Quality in Street Lighting