Abstract

The details of a study of the spectral energy distribution from 340 to 700 mμ of light from the northwestern sky at New Delhi, India, during the monsoon months of July, August, and September are given, along with a brief description of the salient features of the curves. The CIE color coordinates and the correlated color temperatures have been determined for all the curves. These and the results of earlier workers have been discussed in relation to the Abbot–Gibson curve and the E1E2 curve of Henderson and Hodgkiss.

© 1965 Optical Society of America

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References

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  1. K. S. Gibson, J. Opt. Soc. Am. 30, 88 (1940).
  2. “Report of the Color Appraisal Task Commitee,” Illum. Engr.52, 493 (1957).
  3. Recommendation of the Cotton Committee of D-13 of the ASTM (D1684-59T).
  4. D. Nickerson, J. Opt. Soc. Am. 50, 57 (1960).
    [CrossRef]
  5. A. W. S. Tarrant, Light and Lighting 56, 264 (1963).
  6. D. B. Judd, J. Opt. Soc. Am. 26, 421 (1936).
    [CrossRef]
  7. A. H. Taylor and G. P. Kerr, J. Opt. Soc. Am. 31, 3 (1941).
    [CrossRef]
  8. J. N. Hull, Trans. Illum. Engr. Soc. 19, 21 (1954).
  9. W. E. K. Middleton, J. Opt. Soc. Am. 44, 793 (1954).
    [CrossRef]
  10. B. Hisdal, Archiv. Math. Naturwiss. 54, 35 (1957).
  11. D. L. MacAdam, J. Opt. Soc. Am. 48, 832 (1958).
    [CrossRef]
  12. H. Masaki, Sci. Light 8, 67 (1959).
  13. S. T. Henderson and D. Hodgkiss, Brit. J. Appl. Phys. 14, 125 (1963).
    [CrossRef]
  14. H. R. Condit and F. Grum, J. Opt. Soc. Am. 54, 937 (1964).
    [CrossRef]
  15. D. L. MacAdam, J. Opt. Soc. Am. 53, 397 (1963).
    [CrossRef]
  16. Y. Nayatani and G. Wyszecki, J. Opt. Soc. Am. 53, 626 (1963).
    [CrossRef]
  17. G. J. Chamberlin, A. Lawrence, and A. A. Belbin, Light and Lighting 56, 70 (1963).

1964 (1)

1963 (5)

Y. Nayatani and G. Wyszecki, J. Opt. Soc. Am. 53, 626 (1963).
[CrossRef]

D. L. MacAdam, J. Opt. Soc. Am. 53, 397 (1963).
[CrossRef]

A. W. S. Tarrant, Light and Lighting 56, 264 (1963).

S. T. Henderson and D. Hodgkiss, Brit. J. Appl. Phys. 14, 125 (1963).
[CrossRef]

G. J. Chamberlin, A. Lawrence, and A. A. Belbin, Light and Lighting 56, 70 (1963).

1960 (1)

1959 (1)

H. Masaki, Sci. Light 8, 67 (1959).

1958 (1)

1957 (1)

B. Hisdal, Archiv. Math. Naturwiss. 54, 35 (1957).

1954 (2)

J. N. Hull, Trans. Illum. Engr. Soc. 19, 21 (1954).

W. E. K. Middleton, J. Opt. Soc. Am. 44, 793 (1954).
[CrossRef]

1941 (1)

1940 (1)

K. S. Gibson, J. Opt. Soc. Am. 30, 88 (1940).

1936 (1)

Belbin, A. A.

G. J. Chamberlin, A. Lawrence, and A. A. Belbin, Light and Lighting 56, 70 (1963).

Chamberlin, G. J.

G. J. Chamberlin, A. Lawrence, and A. A. Belbin, Light and Lighting 56, 70 (1963).

Condit, H. R.

Gibson, K. S.

K. S. Gibson, J. Opt. Soc. Am. 30, 88 (1940).

Grum, F.

Henderson, S. T.

S. T. Henderson and D. Hodgkiss, Brit. J. Appl. Phys. 14, 125 (1963).
[CrossRef]

Hisdal, B.

B. Hisdal, Archiv. Math. Naturwiss. 54, 35 (1957).

Hodgkiss, D.

S. T. Henderson and D. Hodgkiss, Brit. J. Appl. Phys. 14, 125 (1963).
[CrossRef]

Hull, J. N.

J. N. Hull, Trans. Illum. Engr. Soc. 19, 21 (1954).

Judd, D. B.

Kerr, G. P.

Lawrence, A.

G. J. Chamberlin, A. Lawrence, and A. A. Belbin, Light and Lighting 56, 70 (1963).

MacAdam, D. L.

Masaki, H.

H. Masaki, Sci. Light 8, 67 (1959).

Middleton, W. E. K.

Nayatani, Y.

Nickerson, D.

Tarrant, A. W. S.

A. W. S. Tarrant, Light and Lighting 56, 264 (1963).

Taylor, A. H.

Wyszecki, G.

Archiv. Math. Naturwiss. (1)

B. Hisdal, Archiv. Math. Naturwiss. 54, 35 (1957).

Brit. J. Appl. Phys. (1)

S. T. Henderson and D. Hodgkiss, Brit. J. Appl. Phys. 14, 125 (1963).
[CrossRef]

J. Opt. Soc. Am. (9)

Light and Lighting (2)

A. W. S. Tarrant, Light and Lighting 56, 264 (1963).

G. J. Chamberlin, A. Lawrence, and A. A. Belbin, Light and Lighting 56, 70 (1963).

Sci. Light (1)

H. Masaki, Sci. Light 8, 67 (1959).

Trans. Illum. Engr. Soc. (1)

J. N. Hull, Trans. Illum. Engr. Soc. 19, 21 (1954).

Other (2)

“Report of the Color Appraisal Task Commitee,” Illum. Engr.52, 493 (1957).

Recommendation of the Cotton Committee of D-13 of the ASTM (D1684-59T).

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Figures (3)

Fig. 1
Fig. 1

Thick black points are CIE chromaticity points for all the curves; open circles with points inside and + marks are for the chromaticity values of Middleton for grass covered, snow covered, and urban ground conditions. The isotemperature lines at some temperatures are shown.

Fig. 2
Fig. 2

Spectral energy distribution curves for different sky conditions. A, C, and E—overcast; B and G—covered with thick cumulus clouds; D—clear; F, H, and I—hazy.

Fig. 3
Fig. 3

E1E2 of Henderson and Hodgkiss, Abbot–Gibson curve, the full radiator locus along with our chromaticity points.

Tables (1)

Tables Icon

Table I Chromaticity coordinates of skylight, New Delhi, during monsoon.