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

OS SSL AE Page 1Oct 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


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.



LUMILEDS LEDs setup:

9 white at 5650K3 Royal blue3 Blue3 Cyan3 Green3 Amber3 Redorange3 Red

LUMILEDS Parts from 10/5/2007 to 23/5/2007

LXHL-PM09 CO: MY Brightness U4JLXML-PR01-0275 Royal Blue 270 mW Co0:MYRED 40 lm LXML-PD01-0040Red 30 lm LXML-PD01-0030LXHL-PR09 CO:MY Brightness N5JLXML-PL01-0030LXML-PD01-0040RED-Orange 50 lm LXML-PH01-0050LXML-PB01-0023 CO:MYBLUE 18 lm LXML-PB01-0018 Co0:MYLXHL-PW09 CO:MY Brightness: SWAKGreen 50 lm LXML-PM01-0050 Co0:MYAmber 30 lm LXML-PL01-0030 CoO:MYLXHL-PD09 CO:MY Brightness E4FLXML-PR01-0275LXHL-PH09 Brightness G2GCyan 40 lm LXML-PE01-0040LXHL-PB09 Brightness N1HLXHL-PE09 Brightness T6J


Reference Source:Low voltage 20W clear, 3000K, 300 lm, Ra8= 100


spectra lumileds april 2007

-2.00E-05

0.00E+00

2.00E-05

4.00E-05

6.00E-05

8.00E-05

1.00E-04

1.20E-04

1.40E-04

1.60E-04

18

9

21

1

23

2

25

4

27

5

29

7

31

9

34

0

36

2

38

4

40

5

42

7

44

9

47

1

49

4

51

6

53

8

56

0

58

3

60

5

62

7

65

0

67

2

69

5

71

7

73

9

76

2

nm

valu

e

white 3.16 cd

royal blue 0.2074 cd

blue 0.4298 cd

cyan 0.4844 cd

green 0.4989 cd

amber 0.3425cd

red orange 0.7697 cd

red 0.474 cd


LED spectra from warm luminairein operation, water cooled


spectra lumileds april 2007

-2.00E-05

0.00E+00

2.00E-05

4.00E-05

6.00E-05

8.00E-05

1.00E-04

1.20E-04

1.40E-04

1.60E-04

18

9

21

1

23

2

25

4

27

5

29

7

31

9

34

0

36

2

38

4

40

5

42

7

44

9

47

1

49

4

51

6

53

8

56

0

58

3

60

5

62

7

65

0

67

2

69

5

71

7

73

9

76

2

nm

valu

e

white 3.16 cd

royal blue 0.2074 cd

blue 0.4298 cd

cyan 0.4844 cd

green 0.4989 cd

amber 0.3425cd

red orange 0.7697 cd

red 0.474 cd

White 5650K

Royal blue blue cyan green amber Red orange red

L dom 537 462 481 505 538 594 618 625

I in cd 3.16 0.2074 0.4298 0.4844 0.4989 0.3425 0.7697 0.474

W/steradian 0.009781 0.004313 0.003542 0.00154 0.0009255 0.0007344 0.003439 0.002867

Vis. Effic % 47.38 7.057 17.8 46.12 79.02 68.31 32.79 24.21


LED data, warm light source,water cooled



Comparison with current competitor sources:

incandescent Fl cool white Fl white

Fl warm white Metal Halide Sodium and Scandium

Metal Halide Dysprosium and Thalium


White

0

0.00001

0.00002

0.00003

0.00004

0.00005

0.00006

0.00007

0.00008

0.00009

18

9

20

7

22

6

24

4

26

2

28

0

29

8

31

6

33

5

35

3

37

1

38

9

40

8

42

6

44

5

46

3

48

2

50

1

51

9

53

8

55

7

57

6

59

4

61

3

63

2

65

1

67

0

68

9

70

8

72

6

74

5

76

4

white

Lumileds9 Neutral White @ 100%5600K

RA 74

R1 71

R2 79

R3 84

R4 73

R5 71

R6 71

R7 84

R8 61

R9 -20

R10 49

R11 68

R12 45

R13 73

R14 91

R15 0

R16 0

CCT-ref 5600

CCT 5647

x-orig 0.329

y-orig 0.3482

x-ref 0.330158928

y-ref 0.345438417



Right side: 9 White @50%3 Green @100%3 Red @ 80%

Visual matching with 5 people

Left side: low

voltage inc.


White + Green + Red


Match obtained at: Right side: 9 White @50% 3 Green @100% 3 Red @ 80%

50% White + 100% Green + 80% Red

0

0.00002

0.00004

0.00006

0.00008

0.0001

0.00012

18

9

20

9

22

9

24

9

26

9

28

8

30

8

32

8

34

8

36

8

38

8

40

8

42

8

44

9

46

9

49

0

51

0

53

0

55

1

57

1

59

2

61

3

63

3

65

4

67

5

69

5

71

6

73

6

75

7

77

8

50%white 100% Green + 80% red




0

0.00002

0.00004

0.00006

0.00008

0.0001

0.00012

18

9

20

9

22

9

24

9

26

9

28

8

30

8

32

8

34

8

36

8

38

8

40

8

42

8

44

9

46

9

49

0

51

0

53

0

55

1

57

1

59

2

61

3

63

3

65

4

67

5

69

5

71

6

73

6

75

7

77

8


Right side: 9 White @50% 3 Green @100% 3 Red @ 80% Visual matching with 5 people

RA 81

R1 82

R2 98

R3 72

R4 76

R5 88

R6 95

R7 79

R8 57

R9 15

R10 89

R11 73

R12 77

R13 87

R14 82

R15 0

R16 0

LED CCT-ref 3700

LED CCT 3736

x-orig 0.3905

y-orig 0.377

x-ref 0.394592906

y-ref 0.38508139


Match obtained at 3700K


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


Match obtained at 9 White @60% 3 Green @100% 3 Amber @100% 3 Red @ 70%

60% White + 100% Green + 100% Amber + 70% Red

0

0.00002

0.00004

0.00006

0.00008

0.0001

0.00012

18

9

21

0

23

0

25

0

27

1

29

1

31

2

33

2

35

3

37

4

39

4

41

5

43

5

45

6

47

7

49

8

51

9

54

0

56

1

58

3

60

4

62

5

64

6

66

7

68

9

71

0

73

1

75

2

77

4

60%White+100%Green+100%Amber+70%Red




0

0.00002

0.00004

0.00006

0.00008

0.0001

0.00012

18

9

21

0

23

0

25

0

27

1

29

1

31

2

33

2

35

3

37

4

39

4

41

5

43

5

45

6

47

7

49

8

51

9

54

0

56

1

58

3

60

4

62

5

64

6

66

7

68

9

71

0

73

1

75

2

77

4


9 White @60% 3 Green @100% 3 Amber @100% 3 Red @ 70% Visual matching with 5 people

RA 93

R1 99

R2 95

R3 84

R4 90

R5 98

R6 92

R7 93

R8 95

R9 91

R10 83

R11 87

R12 73

R13 99

R14 89

R15 0

R16 0

LED CCT-ref 3550

LED CCT 3530

x-orig 0.3992

y-orig 0.3779

x-ref 0.402491559

y-ref 0.389297851


Match obtained at 3550K



0

0.00002

0.00004

0.00006

0.00008

0.0001

0.00012

18

9

20

9

22

9

24

9

26

9

28

8

30

8

32

8

34

8

36

8

38

8

40

8

42

8

44

9

46

9

49

0

51

0

53

0

55

1

57

1

59

2

61

3

63

3

65

4

67

5

69

5

71

6

73

6

75

7

77

8



Conclusions

A visual match of the low voltage incandescent lamp at 3000K can be obtained with


0

0.00002

0.00004

0.00006

0.00008

0.0001

0.00012

18

9

21

0

23

0

25

0

27

1

29

1

31

2

33

2

35

3

37

4

39

4

41

5

43

5

45

6

47

7

49

8

51

9

54

0

56

1

58

3

60

4

62

5

64

6

66

7

68

9

71

0

73

1

75

2

77

4


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



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



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

Documents

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