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Abstract
This paper describes the design, construction, and characterization of a new instrument for the measurement of geometrically total flux. This is done by measuring the flux emanating from a source in different directions and integrating it over an entire imaginary surface surrounding the source. A new approach is suggested for the realization of the scales of total luminous flux and geometrically total spectral flux. In this approach, these scales would be derived from standards of irradiance and illuminance.