LED Street Light Research Project

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LED color temperatures Dusk to night Open shade at noon Hazy to overcast day Average clear day 10 am to 3 pm Morning and afternoon light 66 Pittsburgh LED Street Light Research Project September 2011 Sunset Cooler Warmer 6500 K 5500 K 3200 K 2700 K 1800 K
Biological/Public Health Considerations › Color Temperature and Circadian Rhythm Bright white light suppresses melatonin, the hormone that regulates tumors. Blue light wavelengths are to blame, because they “reset” the circadian clocks of humans, animals, and plants even at very low levels of blue light. This might account for the significantly higher rates (30-60%) of breast and colorectal cancer in night shift workers. Fully blind people whose melatonin production is never altered have lower incidences of breast cancer. Moreover, remaining in darkness for 8 hours a night is supposed to be ideal for melatonin to work its tumor-suppressing magic. September 2011 Pittsburgh LED Street Light Research Project 67
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LED Street Light Research Project R
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Acknowledgements City of Pittsburgh
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Contents Executive Summary Backgrou
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Executive Summary Background The Ci
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lighting of sidewalks or streets. L
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› LED luminaires should be guaran
Page 13 and 14:
Background Overview The City of Pit
Page 15 and 16: Street Lights: A Brief History The
Page 17 and 18: Electric Street Lighting Technologi
Page 19 and 20: and development focus of the U.S. D
Page 21 and 22: Data Collection LED Street Lighting
Page 23 and 24: › Lower operating costs: energy e
Page 25 and 26: Efficiency (GIB Credit 13). This cr
Page 27 and 28: color bins based on identical or ve
Page 29 and 30: Lighting Standards in the U.S. In t
Page 31 and 32: Existing Infrastructure The City of
Page 33 and 34: Since 2008, the City’s Office for
Page 35 and 36: Business District Case Studies Thre
Page 37 and 38: September 2011 Central Business Dis
Page 39 and 40: September 2011 Mid-Sized Business D
Page 41 and 42: September 2011 Neighborhood Busines
Page 43 and 44: Research Modes of Human Vision Huma
Page 45 and 46: How Uniformity of Illuminance Affec
Page 47 and 48: Overview There is a wide range of i
Page 49 and 50: and landscape is highly contextual.
Page 51 and 52: uilding, pedestrians can see less t
Page 53 and 54: Another factor is the surrounding r
Page 55 and 56: This provides what many lighting pr
Page 57 and 58: will generate up to 130,000 lux. Of
Page 59 and 60: › Use shielded or cut-off luminai
Page 61 and 62: › LEDs are the most efficient, du
Page 63 and 64: The Plan recommends retrofitting st
Page 65: There is an established link betwee
Page 69 and 70: Lighting Plans: Comprehensive Plann
Page 71 and 72: › Helsinki, Finland: Master Light
Page 73 and 74: › Dial4Light: Licht per Anruf (Li
Page 75 and 76: Overview Focus group sessions were
Page 77 and 78: Tools for Measuring Street Lighting
Page 79 and 80: During this measure, the luminance
Page 81 and 82: Overview In February, 2001, Minneap
Page 83 and 84: Recommendations Overview The City o
Page 85 and 86: The revised approach became one of
Page 87 and 88: luminaires. Manufacturers are respo
Page 89 and 90: Base Criteria: Design › Contempor
Page 91 and 92: Evaluation Procedure for Business D
Page 93 and 94: Upgrade Option: Basic Controls In a
Page 95 and 96: › The mounting system will be aff
Page 97 and 98: Pittsburgh. The findings would be s
Page 99 and 100: › Testing of the submitted lumina
Page 101 and 102: References American Association of
Page 103 and 104: Gehl, Jan, Lotte Johansen Kaefer an
Page 105 and 106: U.S. Department of Energy. 2008. LE
Page 107 and 108: Appendices BULB: The light source w
Page 109 and 110: › LUCI (Lighting Urban Community
Page 111 and 112: Sorento Streetlight, Cambridge, UK
Page 113: › Principal Investigator Don Cart
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LED Street Light Research Project

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