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Roadway Lighting: Benefits of Energy Efficient Technologies

Learn the cost and benefit analyses of energy efficient technologies for roadway lighting, including LED and Induction lights. Explore the economic evaluation and available tools for utility CIP managers. See the report at mn.gov/commerce/energy-roadway-leds.

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Roadway Lighting: Benefits of Energy Efficient Technologies

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  1. Cost Benefit Analyses of Energy Efficient Technologies Available for Use in Roadway Lighting Presenters: Gary A. Swanson, PE Energy Management Solutions and John Paulson, City of Hutchinson Moderator: Mary Sue Lobenstein February 20th, 2014

  2. …with funding from the Minnesota Conservation Applied Research and Development (CARD) Grant Program

  3. Info on this project • What did it accomplish? • How it can be useful to utility CIP managers? • Report available at DER website: • mn.gov/commerce/energy-roadway-leds

  4. Brief presentation by John Paulson • City of Hutchinson

  5. Summary • Introduction to LED Lights • What to look for and look out for in Lighting • 10 Step How to Manual for LED Lights • Economic Evaluation • Excel Tool Available • What’s Next?

  6. Introduction to LED Lights (Induction Too) • 13 Million Road way lights in USA • 487,000 in Minnesota (many time more for smaller streets and parking lots) • LED Shoe Box • LED Acorn • LED Cobra Head

  7. Sizes And Types • Many Types and Sizes Today • HID – High Intensity Discharge Lights • Metal Halide (White light) • High Pressure Sodium (Yellow Light) • 400, 250, 175 Watts most common sizes

  8. Why LED or Induction? • Last Longer - 50,000 to 100,000 hours • Less maintenance cost • Safer if lights don’t fail as often • Saves Energy – 50% to 75% of the energy • Brighter Looking Light • Better options for Controlling • Dimming • Part time lighting control • Instant On with interruption of power

  9. Why Consider LEDs Today • There are now hundreds of options for Lights • Costs are coming down dramatically • Quality and consistency have increased • Efficiencies are increasing • Net Result are improved paybacks

  10. Are LEDs Right for You? • 10 Step How-To Manual • Economic Evaluation • Look at all Options • Test Lights – “Seeing is Believing”

  11. Step 1 – New language • Understand the New Terms • Important to Know the Differences • Coefficient of Utilization (CU) • Color Rendering Index (CRI) • Efficacy • Correlated Color temperature (CCT) • See page 3-6 of the report

  12. Step 1 (Cont’d) • Existing Lighting Sources • Metal Halide (MH) • High Pressure Sodium (HPS) • New Lighting Sources • LED or Light Emitting Diode • Induction

  13. Step 2 – Who to Select? • There are hundreds of vendors • Many calling with the “Best in the Market” • Work with reputable companies • They will still be there when you have problems • They will have similar products and color matches • More reliable and better warranty

  14. Step 3 – Compare Apples to Apples • Complete the Roadway Lighting Form and send to selected Manufactures • This will help them give you options for similar products • Some manufactures have 54 options of lights • New Lighting Fixtures • Include mounting costs and options • Review Retrofit Options • More options and lower costs

  15. Base Roadway Form

  16. Forms – Diagram A

  17. Form – Diagram B

  18. Form – Diagram C

  19. Average Maintained Illumination Guideline

  20. Average Maintained Illumination Guideline

  21. Step 4 – Compare Data • Review Useful Life, Operating Temperature and Lumen Depreciation • Most important life factor is thermal management • L70 will show hours it will take for LED to reach 70 % of lighting levels • Life time is important – will range from 50,000 to 100,000 hours – read fine print. • Hours of lamps or drivers – based on X hours per day

  22. “Seeing is Believing” Discrepancy of distribution and glare between HID and LED roadway lights. Source: LED Roadway Lighting

  23. Step 5 – Review Photometric Reports • AGi32 – is standard independent light simulation software that all manufactures should have to simulate their lights • Avoid comparing to Manufactures software • Important that all are simulated the same to compare anticipated lighting outputs

  24. Step 6 – Warranty • Average warranty is 3-5 years • Important to see how manufacture will match replacement lights/modules when LEDs are changing every 6 months. • Warranty for lumen output not just failed light? • Warranty for color shifting?

  25. Step 7 – Controls • Controls are changing daily • Dimming • Daylight • Motion • Timed Illumination • Individual Lights • Wireless controls and programmable • Save 25% more energy

  26. Step 8 – Economics • Evaluate economics of lights to see if payback is acceptable. (See Payback Analysis Sheet) • Can range from 3 to 10 years • Be sure to include discounts from rebates • Local utilities (up to 50%), state and federal (up to 25%) • Make sure to use avoided cost of energy and not average cost of energy ($/kWh) • No demand components (kW) at night • Off Peak energy rates (kWh) • Fuel Cost Adjustment • Riders

  27. Step 8 (Cont’d) A spreadsheet calculator as well as the guidelines and diagrams A, B, & C shown earlier are available: mn.gov/commerce/ energy-roadway-leds

  28. Step 9 – Test Lights First • Test in pairs to get true impact of lights • Test for 4 weeks • Many Manufactures will let you test their fixtures for free for 90 days • Make sure to order mounting brackets if needed and correct voltage

  29. Step 10 – Measure Results • Lumens can be measured before and after • LEDs will have different characteristics • Pupil Lumens, (S/P)0.78, Photopic • Evaluate glare to see if adversely impacting area

  30. Options to Consider • Leasing vs Buying • Many utilities such as Xcel energy offer an option to lease the fixture, energy only, or lease pole/fixture. • Advantages are that you don’t have to take care of the fixture • Disadvantages are that it will cost you more and you will continue to pay • Need to work with utilities on costs if using LED since energy costs will be less

  31. For Utility CIP Managers • Street Lights are many times the highest cost a city has to pay for energy. • One city spent $300,000 in street lighting and only $50,000 for all other energy used. • Cutting street lighting costs by 50% can reduce energy budget by 43%. • Maintenance costs by 80%

  32. For Utility CIP Managers • Consistent lighting can provide bring positive attitude to city • Less outages means less calls, less headaches and more safety for the city • Can save 50% of the energy without controls and 75% with controls • New controls can be added later

  33. For Utility CIP Managers • Select criteria for qualifying products under customer-owned rate codes • Can be used to help meet CIP goals

  34. Any Questions Presented by: Gary A. Swanson, PE Email Address: gswanson@EMSenergy.com Phone Number: (612) 819-7975

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