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Home My WebLink AboutCOM 0038.001 2010-2012County of Hawaii Department of Public Works - Traffic Division December 22, 2010 Xzwft"46am To: Dominic Yagong, Chair and Members of the Hawaii County Council From: Ronald L. Thiel, P.E., Traffic Division Chief SUBJECT: POWER POINT PRESENTATION ON LED STREET LIGHT CODE AMENDMENT I am planning on making a power point presentation to the County Committee and County Council regarding a Code Amendment on Chapter 14 Street Lights which will allow for the use of Light Emitting Diodes (LEDs). The power point presentation has fifteen (15) slides which covers 1. Problems with Low Pressure Sodium lights 2. Spectral Power distribution discussion 3. Solutions offered with LEDs 4. Visuals on proposed LEDs from tests conducted on Kamehameha Ave in Hilo. Comm. No. Ref. To:W K Ref. Date JAN Obi 201Q County of Hawai'I is an Equal Opportunity Provider and Employer. V SUBJECT: POWER POINT PRESENTATION ON LED STREET LIGHT CODE AMENDMENT I am planning on making a power point presentation to the County Committee and County Council regarding a Code Amendment on Chapter 14 Street Lights which will allow for the use of Light Emitting Diodes (LEDs). The power point presentation has fifteen (15) slides which covers 1. Problems with Low Pressure Sodium lights 2. Spectral Power distribution discussion 3. Solutions offered with LEDs 4. Visuals on proposed LEDs from tests conducted on Kamehameha Ave in Hilo. Comm. No. Ref. To:W K Ref. Date JAN Obi 201Q County of Hawai'I is an Equal Opportunity Provider and Employer. Street Lighting and Astronomy Technology Briefing July 201h2010 D&LT Expedition 2010, Milky Way from the Grand Canyon Problem Statement • Traffic Hazard • Color Rendering for Emergency Responders • Light Pollution • • Reduce Price to Operate and Maintain ■ Blue Light Haza The dark side of l007, 43:215 21d: BLUE LIGHT-1Na Padu:al E 101r)(l/ 6 ■ %.019 Chromatic Aberrations i)odl" Lticr i-oiwo u! til'! I I"1 r;U ;ter V.,, Urovor,it/ ,! Mirto(jarn Contrast Is Enhanced by Yellow Lenses Because of Selective Reduction of Short -Wavelength Llg • OptomNtry dnb Vis,irin `.)r,ianr.F, VtjI /7, No, 2, l;o. T'i-81 ■ Bird Migration, Plant Life - Phototrophs Promote Plant Growth In Response to Blue Light In Low Light Environments, Plant r ell Advanced Online Publication, 2000 - rjreen I ight to Bird%, Inve,,tigatiori into Itie effect of bird -friendly lighting - NAM Locatie L15 -FA -1 Reporl, 2007 Problem One - Traffic Hazard The amber traffic light has the same color as the LPS street light. This causes confusion with drivers approaching an intersection. The confusion is compounded with poor weather. Solution - Install a street light that emits a colored light very different than the amber traffic light. r� U Problem One - Traffic Hazard Can you tell which light is t regulate traffic and which i ;., •' ,.' to light the street? H a Problem Two - Color Rendering Colors must be seen by Emergency Responders. All colors appear Amber/Yellow with LPS. This can result in mistakes by EMTs. Solution - Install a broader spectrum street light that allows the Emergency Responder to distinguish colors LIPS Source fdnren Green BI„e-Gree„ Red Violet• Red Blue- Violet Violet Yellow LED Source of"”- Yeliaw Yellow Green 4tanve Red- Gf4a 11 or# npe taiue�3r�tAn Red Violet Hl,ia Re[t Blur Violet VI„tet • Problem Three - Light Pollution Utah Section - International Dark Sky Association • • Problem Three - Light Pollution White light is a poor option for astronomical studies. The blue light portion of white light scatters in the atmosphere, causing light pollution that jeopardizes the night sky. Solution — Install street lights with a Spectral Power Distribution that has a low blue content AND a color very different from the amber traffic light at intersections and crosswalks. 0 Problem Three -Light Pollution Sky Quality Greatest Disruption of Astronomy and Circadian Rhythm Increased Glare and Discomfort Recommended Wavelengths for excellent night sky quality LPS AND Amber Traffic Lights 400 450 500 550 600 650 700 750 Wavelength (nm) 0 1.0 C 0 0.8 Cn 0 L 0.6 0 a 0.4 N CL (n Greatest Disruption of Astronomy and Circadian Rhythm Increased Glare and Discomfort Recommended Wavelengths for excellent night sky quality LPS AND Amber Traffic Lights 400 450 500 550 600 650 700 750 Wavelength (nm) 0 Problem Three -Light Pollution Human Vision M-4 1.0 N 0.8 CO > 0.6 x 0.4 0.2 0.0 •••••• Scotopic (low light level) Response (Rods) - - Photopic (higher light level) Response (Cones) White LED i : 00 0 1 1 1 1 1 1 1 1 I 1 1 1 tI..I... ...... 400 450 500 550 600 Wavelength (nm) Violet Blue Green Yellow 650 700 750 Red 0 1.0 LPS OB.......... ... ... . ......... ... ... ... . 0.6 .......... ... . 0.4 . ... .. 02 1-4.I I. .. . ... ... .... t 0.0 . I I I I I I A . 400 450 500 SM 600 650 700 750 Wavelength (nm) 1.0 0.8 0.6 OA 0.2 0.0 1.0 0.8 0.6 OA 0.2 00 Wavelength (nm) ........... 400 450 500 550 600 Wavelength (nm) Violel Blue Green Yellow White LED Red YeNow L E SPD of existing LPS. • Color is confused amber traffic light • But SPD good for astronomy • Shielding is not so good for astronomy SPD of White LED Luminaire • Color is different than traffic light • But SPD is bad for astronomy • Shielding is good for astronomy SPD of Yellow LED Luminaire • Color is different than traffic light • SPD is good for astronomy • Shielding good for astronomy • Problem Four -Cost to Operate/Maintain Current Cost to Operate County, HHL and State L KWH CONSUMPTION FOR COUNTY. HHL & STATE LIGHTS Apr -10 Current LPS Fixtures in use Proposed LEDs TYPE KWH KWH # Total Total Blue li ht % per month KWH/ month in use Monthly Cost/ Focture Annual Cost Estimated reduction factor of KWH used 55w & 90w LPS 135w & 180w Filtered Total Estimated reduction factor of KWH used 55w 90w 135w & 180w Filtered Tota 50 MV 0.301 102.3 19 00 MV 0.474 161.2 0 5 LPS 0.063 21.3 25 5 LPS 0.084 28.5 5,683 161,966 $54,582 $654,988 1.0 161,966 0.6 97,179 0 LPS 0.144 44.6 2295 102,357 $34,494 $413,932 1.0 102,357 0.6 61,414 135 LPS 0.205 61.9 256 15.W $5.340 $64.083 0.6 9,508 0.6 9,508 180 LPS 0.229 77.81 1,170 91,0261 $30,676 $368109 0.6 54 0.6 54,616 100 HPS 0.148 50.3 16 150 HPS 0.210 71.4 0 50 HIPS 0.324 110.2 0 00 HPS 0.500 170.0 1 175 MH 0.216 73.4 15 _ 50 MH 0.3011 102.31 5 9AW 371,1951 1 $1,501 112 328,446 _ 222,717 9,485 Current cost per KWH avers a Total Annual Cost 0.331 $1,501,112 KWH/mo $1,328,235 KWH/mo $900,667, Annual Savings $0 1 1 $172,8771 1 $600,445 Problem Four -Cost to Operate/Maintain Solution — Installing LED street lights at intersections and crosswalks is estimated to produce annual savings of over $170,000. KWH CONSUMPTION FOR COUNTY_ HHL Apr -10 Current LPS Fixtures in use Proposed LEDs TYPE KWH KWH # Total Total Blue light % per month KWH/ month in use Monthly Cost/ Fixture Annual Cost Estimated reduction factor of KWH used 55w & 90w LPS 135w & 180w Filtered factor Total Estimated reduction of KWH used 55w, 90w 135w & 180 Filtered Tot 50 MV 0.301 102.3 19 400 MV 0.474 161.2 0 35 LPS 0.063 21.3 25 55 LPS 0.084 28.5 5,683 161,966 $54,582 $654,988 1.0 161,966 0.6 9 1179 0 LPS 0.144 44.6 2,295 102,357 $34,494 $413,932 1.0 102,357 0.6 1,414 135 LPS 0.205 61.9 256 15,846 $5,340 $64,083 0.6 9,508 0.6 9 508 180 LPS 1 0.229 77,81 1,170 91,026 $30,676 $368,109 0.6 54,616 0.6 54,616 100 HPS 0.148 50.3 16 150 HPS 0.210 71.4 0 250 HPS 0.324 110.2 0 400 HPS 0.500 170.0 1 175 MH 0.216 73.4 15 250 MH 0.301 102.3 5 SIAN 371,1951 $1,501,112 328,446 222,717 91485 KWH/mo KWH/mo Current cost per KWH average Total Annual Cost 0.337 $1,501,112 $1,328,231 _ $900,667 Annual Savings $0 $172,877 5 • Hilo Intersection Ll /'` .loop- �, Hilo Intersection Thank You