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Claudia Elkins and Marc W. van Iersel

Methods Experimental setup, plant material, and growing conditions. An adaptive lighting system was used to study the effect of providing a DLI of 12 mol·m −2 ·d −1 over four photoperiods (12, 15, 18, and 21 h). The study was conducted in a glass

Open access

Geoffrey Weaver and Marc W. van Iersel

provided to reach a minimum DLI of 17 mol·m −2 ·d −1 using an adaptive lighting system. We hypothesized that reaching the same DLI, with a longer photoperiod and lower average PPFD s, will result in increased growth for this romaine-type lettuce