All they had to say about spectral response requirements for the meter was that it had to be "continuous in the range between 350 nm and 700 nm." But the test seemed less complete, only requiring that the light detector match readings (at fixed luminances) at 2854 K vs 4700 K.
From ANSI PH3.49 - 1971, Appendix B:
The primary standard for color temperature of a 4700 K radiation consists of a tungsten lamp operated at 2854 K in combination of the Davis and Gibson filter. This source not only matches closely the spectral-energy distribution of a blackbody at 4700 K, but is also reproducable from specifications.