Abstract
A new system of photographic photometry with "ORTHOGRAPHIC PROJECTION CAMERA" has been developed for the measurement of luminance and luminance distribution. This method has been made to be simple and practical with adoption of "COLOUR DATA SYSTEM" and ordinary photosensitive materials, and its relative measurement error has been estimated within 10% including that of the luminance meter used in calibration. Many tests and practical measurements have convinced the author that it is very excellent and expected to be widely put into practical use in all the fields of lighting science and engineering.
