Optimization of LED Lighting for Clinical Settings
Table 2
33 optimised mixtures of the four selected LED colours.
SPD no.
CCT (K)
COI
CIE CRI results
IES TM-30-15 results
Surface colour giving Rfmin
OI
Ra
R9
R13
LER (lm/w)
Rf
Rg
Rfskin
Rfmin
imin
1
3304
0.96
91
49
95
354
90
99
91
75
40
Dark greenish-grey (F)
562
2
3311
1.49
90
40
92
362
89
95
89
74
42
Olive-green (F)
546
3
3365
1.22
93
61
98
339
89
103
91
67
20
Orange-brown (F)
567
4
3381
0.88
92
59
97
344
90
102
92
73
20
Dark orange (F)
572
5
3401
2.2
94
88
99
339
91
103
96
72
42
Olive-green (F)
608
6
3444
0.96
93
68
98
344
90
102
93
74
42
Olive-green (F)
585
7
3462
0.85
93
69
99
336
90
104
93
68
20
Orange-brown (F)
579
8
3488
1.29
94
81
97
326
89
106
93
62
20
Orange-brown (F)
581
9
3526
1.17
94
91
97
331
90
105
96
71
42
Olive-green (F)
605
10
3607
1.49
92
66
97
182
90
102
93
74
42
Olive-green (F)
548
11
3608
1.27
94
85
96
324
89
107
94
62
20
Orange-brown (F)
585
12
3716
0.86
92
98
94
317
89
108
96
63
20
Dark orange (F)
595
13
3744
0.71
92
96
95
322
89
107
97
67
42
Olive-green (F)
600
14
3744
3.11
93
81
95
317
88
108
92
55
20
Dark orange (F)
567
15
3753
1.17
91
84
90
310
88
110
97
62
20
Orange-brown (F)
574
16
3880
1.24
93
91
96
323
89
107
96
65
20
Orange-brown (F)
595
17
3895
1.41
93
94
95
319
89
108
96
63
20
Orange-brown (F)
594
18
4060
2.17
93
80
99
329
89
105
95
68
20
Dark orange (F)
590
19
4199
2.49
80
24
79
286
83
115
92
55
42
Olive-green (F)
470
20
4222
1.49
89
79
93
316
88
108
98
64
42
Olive-green (F)
574
21
4277
0.92
90
79
91
309
87
109
98
62
42
Olive-green (F)
569
22
4308
3.33
92
97
93
193
88
108
96
59
20
Orange-brown (F)
564
23
4431
0.83
88
69
90
306
87
110
97
61
42
Olive-green (F)
553
24
4669
1.5
82
32
81
286
83
114
93
54
42
Olive-green (F)
482
25
4694
1.05
87
61
90
303
86
110
96
59
42
Olive-green (F)
540
26
4944
1.33
83
33
82
287
83
114
93
54
42
Olive-green (F)
485
27
5111
0.82
83
37
84
291
84
113
94
54
42
Olive-green (F)
494
28
5129
1.4
83
38
87
295
84
112
94
56
42
Olive-green (F)
501
29
5148
2.44
83
44
83
287
83
113
94
53
42
Olive-green (F)
497
30
5196
1.44
77
4
76
277
81
116
90
49
42
Olive-green (F)
432
31
5211
0.77
82
31
84
290
83
114
93
54
42
Olive-green (F)
485
32
5243
3
88
75
91
301
86
110
97
58
42
Olive-green (F)
555
33
5331
3.37
88
77
91
301
86
110
97
57
42
Olive-green (F)
556
Final recommendation: SPD nos. 1, 9, 13, 17, 20, 25, 28, and 32. Note that SPDs 22 and 33 are slightly outside the COI recommendations. Colour descriptions are our own interpretations of TM-30-15 test colours; type F are print colours.