Abstract

An apparatus has been assembled and is presently being used to evaluate the color temperatures of incandescent tungsten lamps by physical comparison techniques. A red-to-violet ratio method of establishing the effective slope of the radiometric function is utilized. The apparatus uses a single 931-A photomultiplier to receive radiations from the “standard” and “unknown” lamps through red and violet filters sequentially. Resultant oscilloscope patterns are judged for equality. Accurate results can be obtained in a short period of time, thus permitting large quantities of lamps to be calibrated with a minimum of effort.

© 1952 Optical Society of America

A Photoelectric Color Temperature Meter for Incandescent Lamps

M. H. Sweet
J. Opt. Soc. Am. 30(11) 568-571 (1940)

Physical Photometry in the Purkinje Range

W. S. Plymale and G. T. Hicks
J. Opt. Soc. Am. 42(5) 344-348 (1952)

Light and Dark Adaptation and the Perception of Color*

R. W. G. Hunt
J. Opt. Soc. Am. 42(3) 190-199 (1952)

An Apparatus to Measure Color Temperature of Incandescent Lamp Filaments

Clayton H. Sharp
J. Opt. Soc. Am. 20(2) 62-70 (1930)

Changes in Color Temperature of Tungsten-Filament Lamps at Constant Voltage*

Deane B. Judd
J. Opt. Soc. Am. 26(11) 409-420 (1936)