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I did a couple of tests with a Bowens umbrella. Cover on vs. cover off was worth a stop. Moving the umbrella from where I would normally position it, to the end of the shaft caused a loss of a third of a stop. Mileage probably varies with the brand of lamp and umbrella.
The white part alone was more reflective than I expected! With the cover off, only a third of a stop more light goes through than is reflected back. That’s a lot of spill!