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LEDs… Doing More With Less

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					                           LEDs…
                    Doing More With Less
TAF – LightSavers
 Symposium




                                       Shirley Coyle, LC
                                       General Manager
                                   Ruud Lighting Canada
TAF - LightSavers Symposium

                              LED
                              HPS
                              High Brightness (HB) White LED
TAF - LightSavers Symposium




                               Best Efficacy HB White LED
                                    ~6000 K Correlated Color Temperature (CCT)
                                       Limited Indoor Applications
                                       Appropriate for Many Outdoor Applications
                                Warmer LEDs – lower efficiency
                               Photopic vs Scotopic
TAF - LightSavers Symposium




                              Traditional lumen measurement – based on daytime,
                                cone-based vision under high light levels (cones are
                                      more sensitive to yellow wavelengths)
                                      Colour Quality
TAF - LightSavers Symposium




                                                     CRI S/P Ratio
                              – HPS                  ~22 0.65
                              – MH (4000K)           ~65 1.65
                              – HB White LED (6000K) ~75 > 2.0
                                                       Incandescent


                                  HID
TAF - LightSavers Symposium




                                                                  The Sun


                                 FLUOR




                                                                      LED


                              Visible Light Spectrum
                              of Various Sources
                              Why use White Light?
TAF - LightSavers Symposium




                               Qualitative benefits – better colour
                               rendering, preference
                               Measurable Performance – visual
                               acuity, facial recognition
                               Some conflicting research - roadway
                              LED Gas Station Canopy
TAF - LightSavers Symposium




                                                       4000K MH
                                                       ~35 fc




                                 6000K LED
                                 ~35 fc
                                    DOE Gateway Program
                              City of Oakland, CA – Street Lights
TAF - LightSavers Symposium




                               HPS            LED
                              Colour Temperature and Rendering
TAF - LightSavers Symposium




                               HPS
                              Colour Temperature and Rendering
TAF - LightSavers Symposium




                               LED
                              Colour Temperature and Rendering
TAF - LightSavers Symposium




                              HPS




                              LED
                                            Photopic Illuminance
TAF - LightSavers Symposium



                                HPS                                                                                                                                                                                                 0'




                               Avg: 0.80
                                    fc                                                                                                                                                                                              12'




                              Uniformity:                                                                                                                                                                                           24'




                                40.00/1
                                                                                                                                                                                                                                    36'
                                            0'   12'                   24'                36'                 48'                 60'                   72'                   84'                   96'                   108'   120'
                                                  0-2.5    2.5-5   5-7.5     7.5-10   10-12.5   12.5-15   15-17.5   17.5-20   20-22.5     22.5-25   25-27.5         27.5-30   30-32.5     32.5-35    35-37.5    37.5-40




                                LED                                                                                                                                                                                                  0'




                              Avg: 0.53                                                                                                                                                                                              12'




                                    fc
                                                                                                                                                                                                                                     24'



                              Uniformity:
                                16.00/1     0'   12'
                                                       0-2.5   2.5-5
                                                                       24'
                                                                         5-7.5   7.5-10
                                                                                          36'
                                                                                          10-12.5   12.5-15
                                                                                                              48'
                                                                                                              15-17.5   17.5-20
                                                                                                                                  60'
                                                                                                                                    20-22.5   22.5-25
                                                                                                                                                        72'
                                                                                                                                                              25-27.5
                                                                                                                                                                              84'
                                                                                                                                                                        27.5-30     30-32.5
                                                                                                                                                                                                    96'
                                                                                                                                                                                              32.5-35     35-37.5
                                                                                                                                                                                                                          108'
                                                                                                                                                                                                                    37.5-40
                                                                                                                                                                                                                                    36'
                                                                                                                                                                                                                                 120'
                                                  Mesopic Illuminance
                                                                                        (based on MOVE* model)
                                HPS
TAF - LightSavers Symposium



                               Avg: 0.74
                                                                                                                                                                                                                                                           0'




                                    fc                                                                                                                                                                                                                     12'




                              Uniformity:                                                                                                                                                                                                                  24'



                                38.48/1
                                                                                                                                                                                                                                                           36'
                                             0'   12'                       24'                     36'                   48'                     60'                      72'                   84'                      96'                    108'   120'
                                                        0.0-2.5   2.5-5.0   5.0-7.5    7.5-10.0   10.0-12.5   12.5-15.0   15.0-17.5   17.5-20.0   20.0-22.5    22.5-25.0    25.0-27.5    27.5-30.0     30.0-32.5   32.5-35.0    35.0-37.5   37.5-40.0




                                LED                                                                                                                                                                                                                        0'




                              Avg: 0.68                                                                                                                                                                                                                    12'



                                    fc
                              Uniformity:
                                                                                                                                                                                                                                                           24'




                                19.88/1     0'    12'                       24'                    36'                    48'                     60'                      72'                   84'                      96'                    108'
                                                                                                                                                                                                                                                           36'
                                                                                                                                                                                                                                                        120'
                                                        0.0-2.5   2.5-5.0    5.0-7.5   7.5-10.0   10.0-12.5   12.5-15.0   15.0-17.5   17.5-20.0    20.0-22.5   22.5-25.0     25.0-27.5   27.5-30.0     30.0-32.5   32.5-35.0    35.0-37.5   37.5-40.0




                                                                                  *
                                                                                      Mesopic Optimization of Visual Efficiency
                                                                                    Mesopic
                                                                                                     (MOVE)
                                    MOVE* model
TAF - LightSavers Symposium




                              General Performance Assessment
                              – “Can it be seen” - Contrast Threshold
                              – “How quickly” - Reaction Time
                              – “What is it” - Recognition Threshold
TAF - LightSavers Symposium


                         Which do you prefer?
                              Survey Results
TAF - LightSavers Symposium




                              General luminaire preference
                               – LED: 14 of 20 respondents
                               – No Preference: 3 of 20
                               – HPS: 3 of 20
                              Better nighttime visibility
                               – LED: 16 of 20 respondents
                               – No difference: 4 of 20
                               – HPS: 0 of 20
                              Efficacy
TAF - LightSavers Symposium



                              HPS
                              – Estimated Source Efficacy
                                    78.51 lumens/watt (initial)
                                    70.25 lumens/watt (mean)
                              – Estimated Luminaire Efficacy
                                    66.74 lumens/watt (initial)
                                    59.71 lumens/watt (mean)


                              LED
                              – Estimated Luminaire Efficacy
                                    57.5 lumens/watt (initial)
                                    48.88 lumens/watt (mean)
                              Power
TAF - LightSavers Symposium




                               HPS
                               – Power: 121.0 watts
                               – Estimated Electricity: 496 kWh/ year


                               LED
                               – Power: 77.7 watts
                               – Estimated Electricity: 319 kWh/ year


                               Savings: 43.4 watts, 178 kWh/ year
                              Tunnels, Bridges, Underpasses
TAF - LightSavers Symposium



                               Reduce maintenance and down-time
                               must meet or exceed standards




                              Before-HPS         After - LED
                              Parking Structures
                                  Long on hours (often 24/7)
TAF - LightSavers Symposium




                                  Long periods of inactivity – use
                                  occupancy sensors




                                 Before-MH        After - LED
TAF - LightSavers Symposium

                              Raleigh Convention Center
                              Parking Lots
                              Uniformity improved, minimums met,
TAF - LightSavers Symposium




                              lower average fc – no hot spots
                              U.S. DOE – programs for solid state
TAF - LightSavers Symposium




                              lighting – CALiPER, Gateway
                              Pathways
TAF - LightSavers Symposium



                              Improved uniformity
                                      =
                               Improved visibility
                              Security/Perimeter
                               better uniformity = improved visibility
TAF - LightSavers Symposium




                               colour, face identification




                              HPS                                   LED
                              LEDs: doing more with less
TAF - LightSavers Symposium



                               Use less light, but more effectively
                               Use white light – better visibility
                              Questions?       Thank You
TAF - LightSavers Symposium



                                           shirley.coyle@ruud.ca
                                                www.ruud.ca

				
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posted:3/26/2011
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