Digital light measuring device

A digital light measuring device capable of measuring a flash of light generated by a separate light source device comprises means responsive to an incident light intensity for producing an output commensurate thereto;

• means for processing said output to form a digital signal indicative of a result of the light measurement;
• means for controlling the operations of said processing means in a programmed sequence, said controlling means being adapted to generate a first control signal to be transmitted to the separate light source device for triggering a flash of light and a second control signal for making said processing means begin the processing operation in accordance with the programmed sequence;
• means for directing said controlling means to start said programmed sequence;
• and means for detecting the beginning of change in the output of the producing means caused by a flashing, to generate a third control signal for making said processing means begin the processing operation without said second control signal from said controlling means and to generate a fourth control signal to inform said controlling means of the beginning of the processing operation so that said controlling means can make necessary operations in accordance with said programmed sequence without the direction from the directing means, whereby the digital light measuring device is capable of timely responding to a flash of light occurring without control of said first control signal from said controlling means.