Spectral Energy Distribution of the International Commission on Illumination Light Sources A, B, and C*

Raymond Davis; Kasson S. Gibson; Geraldine Walker Haupt

doi:10.1364/JOSA.43.000172

Journal of the Optical Society of America
Vol. 43,
Issue 3,
pp. 172-176
(1953)
•https://doi.org/10.1364/JOSA.43.000172

Spectral Energy Distribution of the International Commission on Illumination Light Sources A, B, and C

Raymond Davis, Kasson S. Gibson, and Geraldine Walker Haupt

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Raymond Davis, Kasson S. Gibson, and Geraldine Walker Haupt, "Spectral Energy Distribution of the International Commission on Illumination Light Sources A, B, and C*," J. Opt. Soc. Am. 43, 172-176 (1953)

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Abstract

Standard light sources A, B, and C were adopted by the International Commission on Illumination (C.I.E.) in 1931 for the colorimetry of materials. Source A is an incandescent lamp operated at 2854°K. Sources B and C, representative of average noon sunlight and average daylight, respectively, are produced by passing radiant flux from source A through specified Davis-Gibson filters described in Bureau of Standards Miscellaneous Publication M114 (1931).

The C.I.E. published relative energy data only from 370 to 720 mµ. The present paper gives data for these sources in the ultraviolet and extends the data in the red to 780 mµ. The new data were reported through the U. S. Secretariat Committee to the C.I.E. at its 1951 meeting. The values in the ultraviolet were reported to the Optical Society of America at its March, 1952, meeting.

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Observer	Correlated color temperature, degrees Kelvin				Departure from design color temperature µrd
	c₂ = 14 350		c₂ = 14 380		Departure from design color temperature µrd
	Source B	Source C	Source B	Source C	Source B	Source C
O.S.A. “Excitations”	4800	6500	4810	6514	0.0	0.0
1951 C.I.E. Tentative	4815	6560	4825	6574	0.7	1.4
1931 C.I.E. Standard	4860	6726	4870	6740	2.6	5.4

Wave length (mµ)	E_A	E_B	E_C	T_B	T_C	T_W
300	0.93	0.0	0.0	0.000	0.000	0.010
10	1.36	0.0	0.0	0.000	0.000	0.102
20	1.92	0.0₂	0.0₁	0.003	0:001	0.314
30	2.66	0.5	0.4	0.048	0.025	0.536
40	3.58	2.4	2.7	0.175	0.120	0.702
350	4.74	5.6	7.0	0.301	0.231	0.798
60	6.14	9.6	12.9	0.402	0.330	0.849
70	7.82	15.2	21.4	0.498	0.429	0.871
80	9.79	22.4	33.0	0.588	0.529	0.885
90	12.09	31.3	47.4	0.666	0.615	0.889
400	14.71	41.3	63.3	0.721	0.675	0.891
10	17.68	52.1	80.6	0.757	0.714	0.892
20	21.00	63.2	98.1	0.774	0.733	0.893
30	24.67	73.1	112.4	0.761	0.714	0.894
40	28.70	80.8	121.5	0.723	0.663	0.895
450	33.09	85.4	124.0	0.663	0.587	0.896
60	37.82	88.3	123.1	0.601	0.511	0.897
70	42.87	92.0	123.8	0.551	0.453	0.898
80	48.25	95.2	123.9	0.507	0.402	0.900
90	53.91	96.5	120.7	0.460	0.351	0.901
500	59.86	94.2	112.1	0.404	0.293	0.902
10	66.06	90.7	102.3	0.353	0.243	0.903
20	72.50	89.5	96.9	0.317	0.210	0.904
30	79.13	92.2	98.0	0.300	0.194	0.904
40	85.95	96.9	102.1	0.290	0.186	0.904
550	92.91	101.0	105.2	0.279	0.178	0.904
60	100.00	102.8	105.3	0.264	0.165	0.904
70	107.18	102.6	102.3	0.246	0.1497	0.904
80	114.44	101.0	97.8	0.227	0.1338	0.904
90	121.73	99.2	93.2	0.209	0.1199	0.903
600	129.04	98.0	89.7	0.195	0.1090	0.902
10	136.34	98.5	88.4	0.186	0.1016	0.902
20	143.62	99.7	88.1	0.178	0.0961	0.902
30	150.83	101.0	88.0	0.172	0.0914	0.901
40	157.98	102.2	87.8	0.166	0.0871	0.900
650	165.03	103.9	88.2	0.162	0.0838	0.900
60	171.96	105.0	87.9	0.157	0.0801	0.900
70	178.77	104.9	86.3	0.151	0.0756	0.900
80	185.43	103.9	84.0	0.1440	0.0710	0.900
90	191.93	101.6	80.2	0.1360	0.0654	0.898
700	198.26	99.1	76.3	0.1284	0.0604	0.897
10	204.41	96.2	72.4	0.1210	0.0555	0.893
20	210.36	92.9	68.3	0.1134	0.0509	0.883
30	216.12	89.4	64.4	0.1063	0.0467	0.871
40	221.66	86.9	61.5	0.1007	0.0435	0.863
750	227.00	85.2	59.2	0.0964	0.0409	0.861
60	232.11	84.7	58.1	0.0938	0.0392	0.862
70	237.01	85.4	58.2	0.0926	0.0385	0.864
80	241.67	87.0	59.1	0.0925	0.0384	0.866

Observer	Correlated color temperature, degrees Kelvin				Departure from design color temperature µrd
	c₂ = 14 350		c₂ = 14 380		Departure from design color temperature µrd
	Source B	Source C	Source B	Source C	Source B	Source C
O.S.A. “Excitations”	4800	6500	4810	6514	0.0	0.0
1951 C.I.E. Tentative	4815	6560	4825	6574	0.7	1.4
1931 C.I.E. Standard	4860	6726	4870	6740	2.6	5.4

Wave length (mµ)	E_A	E_B	E_C	T_B	T_C	T_W
300	0.93	0.0	0.0	0.000	0.000	0.010
10	1.36	0.0	0.0	0.000	0.000	0.102
20	1.92	0.0₂	0.0₁	0.003	0:001	0.314
30	2.66	0.5	0.4	0.048	0.025	0.536
40	3.58	2.4	2.7	0.175	0.120	0.702
350	4.74	5.6	7.0	0.301	0.231	0.798
60	6.14	9.6	12.9	0.402	0.330	0.849
70	7.82	15.2	21.4	0.498	0.429	0.871
80	9.79	22.4	33.0	0.588	0.529	0.885
90	12.09	31.3	47.4	0.666	0.615	0.889
400	14.71	41.3	63.3	0.721	0.675	0.891
10	17.68	52.1	80.6	0.757	0.714	0.892
20	21.00	63.2	98.1	0.774	0.733	0.893
30	24.67	73.1	112.4	0.761	0.714	0.894
40	28.70	80.8	121.5	0.723	0.663	0.895
450	33.09	85.4	124.0	0.663	0.587	0.896
60	37.82	88.3	123.1	0.601	0.511	0.897
70	42.87	92.0	123.8	0.551	0.453	0.898
80	48.25	95.2	123.9	0.507	0.402	0.900
90	53.91	96.5	120.7	0.460	0.351	0.901
500	59.86	94.2	112.1	0.404	0.293	0.902
10	66.06	90.7	102.3	0.353	0.243	0.903
20	72.50	89.5	96.9	0.317	0.210	0.904
30	79.13	92.2	98.0	0.300	0.194	0.904
40	85.95	96.9	102.1	0.290	0.186	0.904
550	92.91	101.0	105.2	0.279	0.178	0.904
60	100.00	102.8	105.3	0.264	0.165	0.904
70	107.18	102.6	102.3	0.246	0.1497	0.904
80	114.44	101.0	97.8	0.227	0.1338	0.904
90	121.73	99.2	93.2	0.209	0.1199	0.903
600	129.04	98.0	89.7	0.195	0.1090	0.902
10	136.34	98.5	88.4	0.186	0.1016	0.902
20	143.62	99.7	88.1	0.178	0.0961	0.902
30	150.83	101.0	88.0	0.172	0.0914	0.901
40	157.98	102.2	87.8	0.166	0.0871	0.900
650	165.03	103.9	88.2	0.162	0.0838	0.900
60	171.96	105.0	87.9	0.157	0.0801	0.900
70	178.77	104.9	86.3	0.151	0.0756	0.900
80	185.43	103.9	84.0	0.1440	0.0710	0.900
90	191.93	101.6	80.2	0.1360	0.0654	0.898
700	198.26	99.1	76.3	0.1284	0.0604	0.897
10	204.41	96.2	72.4	0.1210	0.0555	0.893
20	210.36	92.9	68.3	0.1134	0.0509	0.883
30	216.12	89.4	64.4	0.1063	0.0467	0.871
40	221.66	86.9	61.5	0.1007	0.0435	0.863
750	227.00	85.2	59.2	0.0964	0.0409	0.861
60	232.11	84.7	58.1	0.0938	0.0392	0.862
70	237.01	85.4	58.2	0.0926	0.0385	0.864
80	241.67	87.0	59.1	0.0925	0.0384	0.866

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Journal of the Optical Society of America