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Dr. Martin Moeck, 22. May 2008 Study Objective:

Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People. Dr. Martin Moeck, 22. May 2008 Study Objective: Which LED combinations can achieve a match with the 3000K 100CRI Low Voltage Incandescent?

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Dr. Martin Moeck, 22. May 2008 Study Objective:

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  1. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Dr. Martin Moeck, 22. May 2008 Study Objective: Which LED combinations can achieve a match with the 3000K 100CRI Low Voltage Incandescent? Participants: 1 man (45 years old), 4 women (10, 12, 16 and 44 years old). Participants passed the Ishihara color test. Camera: Minolta Dimage 7i 5.0 Megapixel High Dynamic Range Images obtained from image stacking with exposure times from 4 sec to 1/125 sec High Dynamic Range Software: Photosphere Camera Reference Light Source Color: Minolta Daylight Cloudy Reference lamp in images on left: Low Voltage Halogen 20W 100 CRI 3000K Light source in images on right: LEDs Lumileds from April 2007

  2. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Light Source: Lumileds LEDs Individual dimming of LED colors 9 white at 5600 K, 3 red, 3 redorange, 3 amber, 3 green, 3 cyan, 3 blue, 3 royal blue with PWM Active Water Cooling: LEDs mounted on copper pipe with circulating cold water to maintain low constant junction temp.

  3. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People LUMILEDS Parts from 10/5/2007 to 23/5/2007 LXHL-PM09 CO: MY Brightness U4J LXML-PR01-0275 Royal Blue 270 mW Co0:MY RED 40 lm LXML-PD01-0040 Red 30 lm LXML-PD01-0030 LXHL-PR09 CO:MY Brightness N5J LXML-PL01-0030 LXML-PD01-0040 RED-Orange 50 lm LXML-PH01-0050 LXML-PB01-0023 CO:MY BLUE 18 lm LXML-PB01-0018 Co0:MY LXHL-PW09 CO:MY Brightness: SWAK Green 50 lm LXML-PM01-0050 Co0:MY Amber 30 lm LXML-PL01-0030 CoO:MY LXHL-PD09 CO:MY Brightness E4F LXML-PR01-0275 LXHL-PH09 Brightness G2G Cyan 40 lm LXML-PE01-0040 LXHL-PB09 Brightness N1H LXHL-PE09 Brightness T6J LUMILEDS LEDs setup: 9 white at 5650K 3 Royal blue 3 Blue 3 Cyan 3 Green 3 Amber 3 Redorange 3 Red Reference Source: Low voltage 20W clear, 3000K, 300 lm, Ra8= 100

  4. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People LED spectra from warm luminaire in operation, water cooled

  5. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People LED data, warm light source, water cooled

  6. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Comparison with current competitor sources: Fl cool white Fl white incandescent Fl warm white Metal Halide Sodium and Scandium Metal Halide Dysprosium and Thalium

  7. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Lumileds 9 Neutral White @ 100% 5600K

  8. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Right side: 9 White @50% 3 Green @100% 3 Red @ 80% Visual matching with 5 people Left side: low voltage inc. White + Green + Red

  9. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Match obtained at: Right side: 9 White @50% 3 Green @100% 3 Red @ 80%

  10. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Right side: 9 White @50% 3 Green @100% 3 Red @ 80% Visual matching with 5 people Match obtained at 3700K

  11. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Right side: 9 White @60% 3 Green @100% 3 Amber @100% 3 Red @ 70% Visual matching with 5 people Left side: low voltage inc. White + Amber + Green + Red

  12. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Match obtained at 9 White @60% 3 Green @100% 3 Amber @100% 3 Red @ 70%

  13. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People 9 White @60% 3 Green @100% 3 Amber @100% 3 Red @ 70% Visual matching with 5 people Match obtained at 3550K

  14. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Conclusions A visual match of the low voltage incandescent lamp at 3000K can be obtained with White 5650K + G + R at 3700K and CIE xy coordinates 0.3905, 0.3770 and CRI 81 White 5650K + G + Amber + R at 3550K and CIE xy coordinates 0.3992, 0.3779 and CRI 91

  15. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Conclusions, continued The participants expressed concern that it was impossible to exactly match the appearance of low voltage incandescent with LEDs since „something is missing“ Nevertheless, they preferred a match of white+green+amber+red instead of white+green+red They rejected trials without green

  16. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Conclusions, continued Red-orange was rejected as a member for matching, since it created an artificial glow and seemed to too much of a good thing Every LED combination seemed to be missing the whitish-light yellow appearance of the low voltage incandescent Amber with white, green and red is necessary to achieve a CRI over 90 Without amber, the CRI hovers around 80

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