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@fygsin has this more or less correct, but to expand on the answer: This is long so TL:DR - In vitro = in glass - lab based measurements, not performed using real sunlight. Higher number = better ...
Answer
@fygsin has this more or less correct, but to expand on the answer: This is long so TL:DR - In vitro = in glass - lab based measurements, not performed using real sunlight. Higher number = better ...