Sage Journals: Discover world-class research

Abstract

In a search for an efficient metal halide lamp with a continuous spectrum and only one metallic constituent other than mercury, the spectra, luminous efficacies and colour rendering indices of discharges containing the halides of aluminium, tin and lead have been investigated. The luminous efficacies have maxima which depend on the dosing densities of mercury and metal halide. The highest observed luminous efficacies at 400-500 W were about 109 lm/W for AlCl₃, 90 lm/W for SnCl₂ and 90 lm/W for PbCl₂. Low colour temperatures are obtained at the expense of luminous efficacy and constancy of colour. Arc stability, electrode erosion and reactions with the silica arc tube present problems in making a practical lamp. An alkali halide additive improves the discharges and can provide a high luminous efficacy at a relatively low colour temperature.

Get full access to this article

View all access options for this article.

References

Grabner, H. and Pilz, W. , Proc. 8th international conference on phenomena in ionized gases , Vienna, p. 228 (1967).

Zollweg, R.J. , and Frost, L.S. , Proc. 8th international conference on phenomena in ionized gases, Vienna, p. 224 (1967).

Waymouth, J.F. , Koury, F. , Gungle , W.C. , and Peterson , C. , Illum. Engng , 62, 214 (1967).

Ainsworth, T.S. , and Beeson, E.J.G. , Photographic J., 107, 324 (1967 ).

Fischer, E. , Lorenz, R. , and Rehder, L. , Lichttechnik 24, 513 (1972).

Wharmby, D.O. , and Whittaker, F.L. , Proc. 2nd international conference on gas discharges, London, p. 121 ( IEE, 1972)

Schirmer, H. , and Seehawer, J. , Proc. 8th international conference on phenomena in ionized gases , Vienna, p. 229 (1967).

Mück, G. , Proc. 11th international conference on phenomena in ionized gases , Prague, p. 231 (1973).

Method of measuring and specifying colour rendering properties of light sources , CIE Publication No. 13 (E.- 1. 3. 2) ( 1965).

10.

Pearse, R.W.B. , and Gaydon, A.G. , The identification of molecular spectra, 3rd ed. (Chapman & Hall, London , 1963).

11.

Miescher, E. , Helvetica Phys. Acta., 9, 693 (1936).

12.

Speros, D.M. , Caldwell, R.M. , and Smyser, W.E. , High Temperature Sci, 4, 99 (1972)

13.

Prabriputaloong, K. , and Piggott, M.R. , J. Am. Ceram. Soc., 56, 184 (1973).

14.

Higashi, T. , Mori, L. , and Nagano, S. , CIE, Washington, Vol. A, p. 208 (1967 ).

15.

Chalmers, A.G. , and Wharmby, D.O. , British Patent application 3469 (1973).

16.

Dewing, E.W. , J. Am . Chem. Soc., 77, 2639 (1955 ).

17.

Waymouth, J.F. , Electric discharge lamps, p. 218, (MIT Press, 1971).

Comparison of high-pressure discharges in mercury and the halides of aluminium,tin and lead

Abstract

Get full access to this article

References