Beam Candlepower Seconds - A measure of the level of light produced by a bulb or flash unit.
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Flash unit capacity is also described in terms of light output units such as beam candlepower seconds (BCPS) or effective candlepower seconds (ECPS) or in terms of energy capacity units such as joules or watt-seconds.
 See also: Space, Averaging, Back, Stops, Series
  
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