Open room vs closed/reflective yield?

Hollow-Grind

New Member
I was wondering if anyone had grown in a open room environment and then done the same strain in a closed room set-up to see yield difference.

My question is really about reflectivity of the closed room (or reflective walls added) vs a large open room. This is assuming all things can remain equal like temps, humidity, etc.

Wondering if you could be looking a 1 zip per plant difference or more or less. Thanks for any insight.
 
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