Maryland SHA LED Lighting. Brian Grandizio PE / Amol Ranade EIT
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1 Brian Grandizio PE / Amol Ranade EIT
2 Introduction To Technology Roadway Lighting Application Comparison With HID Technology I-83 Pilot Study SHA Implementation Of LED Future Of LED Lighting
3 Introduction To Technology Roadway Lighting Application Comparison With HID Technology I-83 Pilot Study SHA Implementation Of LED Future Of LED Lighting
4 Introduction To Technology Lighting Terminology Lumen Candela Footcandle & Lux Illuminance Luminance Veiling Luminance Glare Reflection & Refraction Correlated Color Temperature Color Rendering Index Cut-off High Intensity Discharge (HID) Lamps Light Emitting-Diode (LED)
5 Introduction To Technology Lighting Terminology Lumen Luminous Flux is commonly called light output and is measured in Lumens A unit of measure of the quantity of light Unit of measure for the output of lamps Why is this important? Lumen Output Varies Depending on the Wattage and Type of Lamp
6 Introduction To Technology Lighting Terminology Candela Intensity of light in a given direction (brightness) is measured in Candelas Core measurement in photometric lab Why is this important? Lighting design computer programs use Candela values to calculate everything
7 Introduction To Technology Lighting Terminology Footcandle The American unit of luminance on a surface One lumen per Foot 2 Lux International unit of luminance on a surface One Lux equals (0.1) foot-candles One lumen per Meter 2 Why is this important? Foot-candles are used in lighting design to predict light levels on the roadway
8 Introduction To Technology Lighting Terminology Illuminance Illuminance is called light level and is measured in Foot-candles or Lux Light that lands on a surface (Roadway) Why is this important? Light design must provide luminance values to adequate light the roadway
9 Introduction To Technology Lighting Terminology Luminance Light that reflects from a surface Quantified in candelas Surface dependent per Meter 2 Luminance is the perceived brightness of a surface How bright an object looks Why is this important? Lighting design must provide luminance values to determine how bridge the roadway surface or will appear
10 Introduction To Technology Lighting Terminology Veiling Luminance Disability glare Glare forms a veil over the eye and hinders the eye s ability to see Why is this important? Glare from roadway lighting needs to be evaluated
11 Introduction To Technology Lighting Terminology Reflection The return of light from a surface Refraction The process by which the direction of a ray of light changes as it passes from one medium to another Why is this important? Light fixtures use reflection and refraction to direct light
12 Introduction To Technology Lighting Terminology Correlated Color Temperature A specification of the color appearance of the light emitted by a lamp, measured in degrees Kelvin. CCT rating for a lamp is a general warmth or coolness measure of it s appearance 1700K Match Flame 1850K - Candle Flame 2200K High Pressure Sodium Lamps 2700 to 3300K Incandescent Lamps 3000K Soft White CFL Lamps 4000 to 5000K Metal Halide Lamps 6500K Daylight, overcast Why is this important? LED lamps have a range of CCT values that can be achieved
13 Introduction To Technology Lighting Terminology Color Rendering Index CRI is a quantitative measure of the ability of a light source to reproduce the colors of various objects faithfully in comparison with an ideal or natural light source Why is this important? The higher the CRI, the better that light source will reproduce the color or various objects
14 Introduction To Technology Lighting Terminology Cut-off A method of classifying luminaires by how much light is emitted above certain angles (typically 80 to 90 degrees) Why is this important? Cut-off fixtures reduce up light and help prevent light pollution Full Cut-off Non-Cut-off
15 Introduction To Technology Lighting Terminology High Intensity Discharge Lamps Why is this important? A type of electrical gas discharge lamp which produces light by means of an electrical arc between electrodes housed inside an arc tube The tube is filled with both gas and metal salts HID Lamp Types High Pressure Sodium Metal Halide Mercury Vapor Low Pressure Sodium Most roadway lighting today uses HID light sources
16 Introduction To Technology Lighting Terminology Light-emitting Diode LED is a semiconductor light source LEDs are available in a wide range of colors LED roadway luminaires are made up of 100s of individual LEDs to produce enough light to replicate HID sources
17 Introduction To Technology How LED Works LED produces light when electrons move around within the semiconductor structure The positive layer has openings for electrons holes The negative layer has free electrons floating around in it When electric charge strikes the semiconductor, it activates the flow of electrons from the negative to the positive layer The excited electrons emit light as they flow into the positively charged holes
18 Introduction To Technology How LED Works Components of LED Fixtures LED Chip Comprised of layers of semi-conducting material Driver Maintains proper current & voltage to LEDs Thermal Heat Sink Used to manage and dissipate heat Lens Used to protect LED chip and aim light Fixture Housing Holds all the components together
19 Introduction To Technology LED Applications LEDs are used for a variety of applications: Status indicators for equipment Flashlights Backlighting for televisions Aesthetic lighting Indoor lighting Roadway Lighting
20 Introduction To Technology Roadway Lighting Application Comparison With HID Technology I-83 Pilot Study SHA Implementation Of LED Future Of LED Lighting
21 Roadway Lighting Application Types of Roadway Lighting Interchange Lighting Intersection Lighting Pedestrian Lighting Other Lighting
22 Roadway Lighting Application Types of Roadway Lighting Interchange Lighting All interchange ramp are lit per SHA preferences Partial Interchange Lighting is preferred Unit Required for Partial Lighting Additional Units for Continuous Lighting
23 Roadway Lighting Application Types of Roadway Lighting Intersection Lighting All signalized intersection are lit Qualifying un-signalized intersections are lit Partial Intersection Lighting is preferred Unit Required for Partial Additional Units for Continuous Lighting
24 Roadway Lighting Application Types of Roadway Lighting Pedestrian Lighting Decorative lighting installed for pedestrians on qualifying streetscape projects Local jurisdiction participation is required
25 Roadway Lighting Application Types of Roadway Lighting Other Lighting Underpass lighting Park & Ride lighting Tunnel lighting Sign Lighting
26 Introduction To Technology Roadway Lighting Application Comparison With HID Technology I-83 Pilot Study SHA Implementation Of LED Future Of LED Lighting
27 Comparison With HID Technology Lamp Life Efficiency Color Temperature Color Rendering Index
28 Comparison With HID Technology Lamp Life High Pressure Sodium: 10,000 to 23,000 Hrs Metal Halide: 6,000 to 20,000 Hrs LED: 50,000 to 100,000+ Hrs
29 Comparison With HID Technology Efficiency High Pressure Sodium: 75 to 130 lumens/watt Metal Halide: 75 to 110 lumens/watt LED: 85 lumens/watt LED luminaires are as much as 30% more efficient using the lumens that are produced An LED fixture producing 17,000 lumens is comparable to an HPS fixture producing 30,000
30 Comparison With HID Technology Correlated Color Temperature High Pressure Sodium: 2200K (Yellow Light) Metal Halide: 4000 to 5000K (White Light) LED: Variable - Can Range From 3000 to 5500K SHA s preferred color temperature for LED lighting less than 4500K
31 Comparison With HID Technology Color Rendering Index High Pressure Sodium: 24 Metal Halide: 85 LED: 65 to 90
32 Introduction To Technology Roadway Lighting Application Comparison With HID Technology I-83 Pilot Study SHA Implementation Of LED Future Of LED Lighting
33 I-83 Pilot Study Site Fixtures Observations & Conclusions
34 I-83 Pilot Study Site I-83 at Warren Road In Baltimore County, Maryland (District 4)
35 I-83 Pilot Study Fixtures Phillips HADCO - RX2120 GE ERMC-0-C3-65-A-2 Dialight SLC4LGH GSSI SLU168 LRL SAT-96M-525Ma-T2
36 I-83 Pilot Study Observations & Conclusions Installed in October 2011 Installed on 40 light poles in the existing spacing that was designed for 250W HPS Fixtures were installed in groups of similar fixtures Fixtures installed were not quite powerful enough to provide required lighting levels based on existing spacing of 250W HPS (decision was made to use more powerful fixtures statewide based on test & photometric calculations) Cooler light provided better quality of lighting Manufacturers involved are considered approved sources after testing of model which meets specifications are complete
37 I-83 Pilot Study Observations & Conclusions
38 I-83 Pilot Study Observations & Conclusions
39 Introduction To Technology Roadway Lighting Application Comparison With HID Technology I-83 Pilot Study SHA Implementation Of LED Future Of LED Lighting
40 SHA Implementation of LED Specification LED Directive Approved Products Implementation Plan Current Projects With LED
41 SHA Implementation of LED Specification Development of Section 806 & Section 950 (Materials) Developed specific photometric requirements that shall be met Photometric requirement ensures a fixture similar to 250W HPS will be used for design and construction Color temperature shall be less than 4500K with CRI above 65 UL approved fixtures required Minimum L70 life of 50,000 hours Must meet IP-65 Spec Approved by FHWA
42 SHA Implementation of LED LED Directive LED luminaires shall be used on all new projects currently in design In the process of adding LEDs to all OOTS Areawide contracts Maintenance contracts will also be adding LEDs into the item lists Highway Projects which have already Advertised without LED Roadway lighting will not be modified Sign lighting will continue to be LED (LED have been in use for sign lighting for years) LED chosen due to long lamp life and energy reduction
43 SHA Implementation of LED Approved Products HADCO - RX2160 GE - Evolve LED Scalable ERS4 Dialight StreetSense SL-3-N-5-S-L-G-H
44 SHA Implementation of LED Current Projects With LED New Areawide signal & lighting tasks US 50 from I-97 to MD 70 I-95 at I-495 Park & Ride I-695 at US 40 in Baltimore County US 50 from MD 8 to US 50/US 301 Split I-895 at MD 2 I-695 at US 1 I-695 at Hollins Ferry Road
45 Future Of LED Lighting Expansion to decorative light fixtures Increased energy efficiency Reduced maintenance requirements Increased lamp life
Basic Lighting Terms Glossary (Terms included in the basic lighting course are italicized and underlined)
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