ELIMINATING THE URBAN TWILIGHT ZONE

Transcription

1 ELIMINATING THE URBAN TWILIGHT ZONE A STUDY OF THE INTERPLAY BETWEEN STREETSCAPE AND PRIVATE SOURCE LIGHTING IN BOSTON S MISSION HILL MAIN STREETS AREA PRESENTED BY LIGHT BOSTON Winter

2 WHY IS GOOD STREETSCAPE LIGHTING IMPORTANT? ADVANCES ENERGY EFFICIENCY ENHANCES SAFETY BY PROMOTING BETTER VEHICULAR AND PEDESTRIAN FLOW AND HEIGHTENING ONE S SENSE OF PERSONAL SECURITY EXTENDS THE LENGTH OF THE BUSINESS DAY PROVIDES A SENSE OF PLACE AND CIVIC PRIDE FOR RESIDENTS AND PROPERTY OWNERS ADDRESSES A CRITICAL QUALITY OF LIFE ISSUE OF AN AGING URBAN POPULATION WHOSE EYESIGHT IS NATURALLY DETERIORATING

3 WHAT DOES GOOD STREETSCAPE LIGHTING DO? UTILIZES CURRENT TECHNOLOGY TO REDUCE ENERGY CONSUMPTION AND MAINTENANCE COSTS OVER TIME CAN PROVIDE EVEN, MULTI SOURCE LIGHT DIRECTED TO BOTH PEDESTRIAN AND VEHICULAR PATHWAYS Louvers and shielding reduce glare and shadow lines and direct light to where it should be Private property owners and commercial tenants are critical participants in creating multi source lighting SCORES HIGH ON THE COLOR RENDERING INDEX (CRI) Allows objects to appear as they really are

4 SAFETY: THE IMPORTANCE OF MULTI SOURCE LIGHTING Mixed Source Lighting: Softening the streetscape shadows Monochromatic Street Lighting Mixed Source Street Lighting Residences on Huntington Ave. (Existing) Commercial Area on Tremont Street (Existing)

5 SAFETY: GLARE IS PUBLIC ENEMY NO. 1 GLARE REDUCTION: Louvered versus Un-louvered Lights Glare producing acorn style pedestrian scale street lighting is unshielded. Drop dish Shoe Box street lighting is unshielded. Louvered Acorn

6 SAFETY: THERE IS NO SUBSTITUE FOR HIGH CRI COLOR RENDERING INDEX (CRI) The measure of the degree of color shift an object undergoes when illuminated by a source of light as compared to how that object is perceived under a perfect rendering source such as sun light. Poor color rendering distorts what we see at night reducing safety. 100 CRI +/-70 CRI 0 CRI

7 LIGHT AND QUALITY OF LIFE: THE AGING EYE Age 20 Age 60 Age 75

8 BETTER BUSINESS: LET THERE BE LIGHT Where would you rather be at night?

9 BETTER BUSINESS: GLARE REDUCTION LOCATION: LUKOIL GAS STATION, TREMONT STREET

10 CIVIC PRIDE: TURNING LEMONS INTO LEMONADE Location: Tremont Street Window Grates for Harvard School of Public Health offices Existing Facade (Nighttime) Proposed Street Lighting (Nighttime)

11 SENSE OF PLACE: LIGHT AT THE TOP OF THE HILL Location: Mission Hill Church Mission Church (daytime) Mission Church (night time) Amiens in France (night time)

12 TECHNOLOGY: FINDING THE RIGHT COMBINATION FOR THE JOB Low Wattage: Promotes Energy Efficiency High CRI: Promotes Safety Long Lamp Life: Lowers Maintenance Cost Low Lumen Fade: Promotes Safety Full Cut Off Capability: Reduces Light Pollution Low CO2-e Emissions: Protects the Environment Low Total Cost of Ownership : Upfront and Installation Costs v. Energy Consumption and Maintenance Savings

13 TECHNOLOGY: COMMON EXTERIOR LUMINAIRES Low pressure sodium orange light High pressure sodium orange or yellow light Fluorescent Lighting Metal Halide Induction Lamp Light Emitting Diodes

14 TECHNOLOGY: BRINGING THE CASE FOR LED SREET LIGHTS TO PRIVATE SECTOR EXTERIOR LIGHTING A Total Cost of Ownership up to 4 times less than conventional street lamp lighting solutions over time IRR s achievable that are well in excess of the current cost of capital Easy Adaptability to Smart Lighting Control Systems that will enhance safety, monitor performance and maximize energy efficiency and longevity of product Enhanced Quality of Life in Public Safety and Aesthetics especially when coupled with Smart Controls

15 NEXT STEPS: WORKING TOWARDS ELIMINATING THE STREETSCAPE TWILIGHT ZONE ESTABLISH A CITY WIDE GOAL COMMIT TO WELL DESIGNED, AESTHETICALLY PLEASING, ENERGY EFFICIENT LIGHTING IN BOTH PUBLIC AND PRIVATE SECTORS ESTABLISH A REGULATORY FRAMEWORK ESTABLISH ARTICLE IN THE ZONING CODE MANDATING REVIEW OF EXTERIOR LIGHTING AND ESTABLISHING STANDARDS FOR EXTERIOR LIGHTING ADDRESS LIGHTING IN ALL ADMINISTRATIVE CONTEXTS Large Project Review; Business Improvement and Historic Districts; and large scale housing developments CAMPAIGN FOR PUBLIC/ MUNICIPAL AWARENESS USE LIGHT BOSTON AS AN ADVOCATE to advance public/private partnerships designed to improve energy efficient, aesthetic lighting of Boston neighborhoods, monuments and public spaces

16 NEXT STEPS: WORKING TOWARDS ELIMINATING THE STREETSCAPE TWILIGHT ZONE

17 APPENDIX: COMPARATIVE LIGHTING MATRIX Lamp Types Low Pressure Sodium High Pressure Sodium Metal Halide Effective Color Energy: Lumens/ Watt Orange 135 to 180 Poor Orange to Yellow 80 to 140 Moderate White 80 to 125 Moderate Induction White 60 to 90 Excellent Fluorescent Yellow to White 60 Excellent LED Huge Range 50 Excellent Mercury Vapor Blue to White 42 Excellent Lumen Fade CRI Lamp Life (Hrs) Other Low Poor 18,000 Hot re-strike: poor optical control Low Poor 24,000 3 to 5 minute warm up High 65 to 92 12,000 to 20,000 Long warm up: Good optical control Stable 80 to ,000 Durable: Instant on and Re- Strike Gradual Fade to Gray 78 to 86 6,000 to 24,000 Quick Start Gradual Fade Varied 50,000 to 100,000 Durable:Heat Management Critical Low Low 24,000 Mercury Hazard and Long Warm up