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Message: <blockquote data-quote="WayneF" data-source="post: 316647" data-attributes="member: 12496">Mine is just one opinion, but yes, close reflecting walls can add to what the light meter sees.  A big and high bare room is a good thing.  Maybe a warehouse.  Maybe outdoors in the night.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />    But if all flashes are carefully in the same situation, the effect and comparison should be the same.  If trying to establish an absolute number, yes, the room might slightly affect the number.  But a comparison still seems valid, if done equally for all flashes.</blockquote>