Wattseconds

A wattsecond is a measure of electrical energy used in flash systems to indicate the amount of energy in the flash capacitors. Since this is only a measure of electrical energy, and does not take into account considerations such as flashtube efficacy, or flash capacitor/flashtube energy transfer efficiency, it is not necessarily a good number to comparatively assess light output. See also effective wattseconds and Lumenseconds.

StudioLighting.net

About StudioLighting.net

A Free Online Resource for Studio Lighting and Photography Information: Tips, Tutorials, DIY Instructions, Reviews, and Much More.