os ssl ae page 1 oct 6, 2008, dr. m moeck visual matching of 3000k low voltage incandescent with led...
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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
OS SSL AE Page 2Oct 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
OS SSL AE Page 3Oct 6, 2008, Dr. M Moeck
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
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
OS SSL AE Page 4Oct 6, 2008, Dr. M Moeck
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
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25
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0
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0
58
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60
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62
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67
2
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71
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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
Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People
LED spectra from warm luminairein operation, water cooled
OS SSL AE Page 5Oct 6, 2008, Dr. M Moeck
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
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0
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2
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0
58
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62
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0
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2
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71
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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
Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People
LED data, warm light source,water cooled
OS SSL AE Page 6Oct 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 white Fl white
Fl warm white Metal Halide Sodium and Scandium
Metal Halide Dysprosium and Thalium
OS SSL AE Page 7Oct 6, 2008, Dr. M Moeck
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
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1
38
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50
1
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7
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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
Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People
OS SSL AE Page 8Oct 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
OS SSL AE Page 9Oct 6, 2008, Dr. M Moeck
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
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9
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9
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9
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8
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65
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69
5
71
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73
6
75
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77
8
50%white 100% Green + 80% red
Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People
OS SSL AE Page 10Oct 6, 2008, Dr. M Moeck
50% White + 100% Green + 80% Red
0
0.00002
0.00004
0.00006
0.00008
0.0001
0.00012
18
9
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9
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9
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9
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71
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77
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50%white 100% Green + 80% red
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
Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People
Match obtained at 3700K
OS SSL AE Page 11Oct 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
OS SSL AE Page 12Oct 6, 2008, Dr. M Moeck
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
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60%White+100%Green+100%Amber+70%Red
Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People
OS SSL AE Page 13Oct 6, 2008, Dr. M Moeck
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
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60%White+100%Green+100%Amber+70%Red
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
Visual Matching of 3000K Low Voltage Incandescent with LED Combinations – a Pilot Study with 5 People
Match obtained at 3550K
OS SSL AE Page 14Oct 6, 2008, Dr. M Moeck
50% White + 100% Green + 80% Red
0
0.00002
0.00004
0.00006
0.00008
0.0001
0.00012
18
9
20
9
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9
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9
28
8
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8
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0
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0
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1
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65
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69
5
71
6
73
6
75
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77
8
50%white 100% Green + 80% red
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
60% White + 100% Green + 100% Amber + 70% Red
0
0.00002
0.00004
0.00006
0.00008
0.0001
0.00012
18
9
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60%White+100%Green+100%Amber+70%Red
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
OS SSL AE Page 15Oct 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
OS SSL AE Page 16Oct 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