Where do I find the dimensions of the Westcott Umbrellas? Does the size reflect the Arc or the diameter of the Umbrella?Updated 4 months ago

Traditional umbrellas are titled with the Arc dimension to indicate the surface area of illumination available to reflect the light.  This follows the historical practice of reporting umbrella sizes.  Both the Arc measurement and diameter/width/length measurements are found in the Specs (specification) tab on the product page.  

With the more recent introduction of Deep Umbrellas, whose arc is nearly double the diameter/width/ length, it was decided that for these units the title should reflect the diameter/width/length rather than the historical standard.