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The impact of LED light spectrum on (A) photosynthetic rate (μmol CO2 m−2 s−1); (B) stomatal conductance (mol H2O m−2 s−1); (C) transpiration rate (mmol H2O m−2 s−1) of green lettuce (Locarno variety) Carmoli variety (red lettuce). Letters indicate significant differences (p < 0.05) between treatments in each experiment. (Capital letters are for green lettuce and small letters are for red lettuce.)
