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Light in Photography -   LIGHTING -  FLASH LIGHTING

Studio Flash



Each flash head has a power rating in watts, and while the compact studio flash heads have the capacitor built in to the head, there are larger units which have several flash heads  flash head can be driven from one large power unit where the capacitors are stored . Most of these units have a dial that allows the photographer to select over several power setting for the particular needs of the shot. Some units do this with a variable control that allows a flash intensity to be used any where on the scale from the lowest setting to full power. Other units do this with a step system only allowing perhaps 1/4, 1/2, and full power. In the adjacent diagram, you will notice that the power settings range from 1/8, 1/4, 1/2, 1/1. Each of these steps is one stop which is equivalent to one stop on the aperture of the camera, one stop on the shutter speed and also one stop in terms of the films asa.


When we look at the power of a light we need to consider the Inverse square law -


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