1. A system for generating a light pulse to cause fluorescence in an object and for generating a control signal to operate a detector to capture the fluorescence, the system comprising:a light emitting diode (LED) light source configured to emit light onto the object, the LED light source having an operational radiant flux;
an imaging sensor configured to sense light emitted due to fluorescence in the object; and
a controller connected to the LED light source, the controller configured to:
drive the LED light source to produce the operational radiant flux,
drive the LED light source to produce a pulse of light at a pulse radiant flux, and
reduce the radiant flux of light produced by the LED light source to below a predetermined value after the pulse for a darkness period,
wherein the pulse radiant flux of the light produced by the LED light source is greater than the operational radiant flux of the LED light source.