1. OS SSL AE Page 1 Oct 6, 2008, Dr. M Moeck 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. OS SSL AE Page 2 Oct 6, 2008, Dr. M Moeck 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. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People

3. OS SSL AE Page 3 Oct 6, 2008, Dr. M Moeck LUMILEDS LEDs setup: 9 white at 5650K 3 Royal blue 3 Blue 3 Cyan 3 Green 3 Amber 3 Redorange 3 Red 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 Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Reference Source: Low voltage 20W clear, 3000K, 300 lm, Ra8= 100

4. OS SSL AE Page 4 Oct 6, 2008, Dr. M Moeck 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. OS SSL AE Page 5 Oct 6, 2008, Dr. M Moeck White 5650K Royal bluebluecyangreenamberRed orangered L dom537462481505538594618625 I in cd3.160.20740.42980.48440.49890.34250.76970.474 W/steradian0.0097810.0043130.0035420.001540.00092550.00073440.0034390.002867 Vis. Effic %47.387.05717.846.1279.0268.3132.7924.21 Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People LED data, warm light source, water cooled

6. OS SSL AE Page 6 Oct 6, 2008, Dr. M Moeck Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Comparison with current competitor sources: incandescent Fl cool whiteFl white Fl warm whiteMetal Halide Sodium and Scandium Metal Halide Dysprosium and Thalium

7. OS SSL AE Page 7 Oct 6, 2008, Dr. M Moeck Lumileds 9 Neutral White @ 100% 5600K RA74 R171 R279 R384 R473 R571 R671 R784 R861 R9-20 R1049 R1168 R1245 R1373 R1491 R150 R160 CCT-ref5600 CCT5647 x-orig0.329 y-orig0.3482 x-ref0.330158928 y-ref0.345438417 Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People

8. OS SSL AE Page 8 Oct 6, 2008, Dr. M Moeck Right side: 9 White @50% 3 Green @100% 3 Red @ 80% Visual matching with 5 people Left side: low voltage inc. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People White + Green + Red

9. OS SSL AE Page 9 Oct 6, 2008, Dr. M Moeck Match obtained at: Right side: 9 White @50% 3 Green @100% 3 Red @ 80% Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People

10. OS SSL AE Page 10 Oct 6, 2008, Dr. M Moeck Right side: 9 White @50% 3 Green @100% 3 Red @ 80% Visual matching with 5 people RA81 R182 R298 R372 R476 R588 R695 R779 R857 R915 R1089 R1173 R1277 R1387 R1482 R150 R160 LED CCT-ref3700 LED CCT3736 x-orig0.3905 y-orig0.377 x-ref0.394592906 y-ref0.38508139 Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Match obtained at 3700K

11. OS SSL AE Page 11 Oct 6, 2008, Dr. M Moeck Right side: 9 White @60% 3 Green @100% 3 Amber @100% 3 Red @ 70% Visual matching with 5 people Left side: low voltage inc. Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People White + Amber + Green + Red

12. OS SSL AE Page 12 Oct 6, 2008, Dr. M Moeck Match obtained at 9 White @60% 3 Green @100% 3 Amber @100% 3 Red @ 70% Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People

13. OS SSL AE Page 13 Oct 6, 2008, Dr. M Moeck 9 White @60% 3 Green @100% 3 Amber @100% 3 Red @ 70% Visual matching with 5 people RA93 R199 R295 R384 R490 R598 R692 R793 R895 R991 R1083 R1187 R1273 R1399 R1489 R150 R160 LED CCT-ref3550 LED CCT3530 x-orig0.3992 y-orig0.3779 x-ref0.402491559 y-ref0.389297851 Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People Match obtained at 3550K

14. OS SSL AE Page 14 Oct 6, 2008, Dr. M Moeck 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. OS SSL AE Page 15 Oct 6, 2008, Dr. M Moeck 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. OS SSL AE Page 16 Oct 6, 2008, Dr. M Moeck 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