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.