Flash lamp usable both as a main and as a slave and connector therefor to an underwater camera

A combined system for underwater photography comprising:

• a flash lamp;
• a camera including an electrical signal emitting terminal which transmits an electrical flash-activating signal towards said flash lamp when said camera is clicked for exposure;
• and
• a camera housing which contains said camera therein, is detachably connectable to said flash lamp and includes a signal converting circuit for receiving said flash-activating signal and correspondingly outputting a converted electrical signal and a cable connector for attaching said camera housing with an optical cable, said cable connector containing therein a light source for emitting a light signal through said optical cable in response to said converted electrical signal from said signal converting circuit;
• wherein said flash lamp comprises:
• a main housing which contains a flash light outputting part;
• a light signal receiving part on said main housing, said light signal receiving part being detachably connectable to an optical cable for transmitting optical signals therethrough, said light signal receiving part having a transparent water-proof window and light sensor means inside said window for sensing light only through said optical cable when said optical cable is attached to said light signal receiving part, sensing light received through said window when said optical cable is detached from said light signal receiving part, and outputting an electrical detection signal in response to said sensed light;
• and
• a signal conversion circuit for receiving said detection signal from said light signal receiving part and transmitting a flash control signal to said flash light outputting part to control light output from said flash light outputting part.