*2.1. Experimental Data—Plant Scale*

Biomass and leaf area per plant showed similar differences among the six light treatments with a BPFD of 60, 110, 160, 210, 260 and 310 µmol m−<sup>2</sup> s −1 (B60–B310). The treatments B110–B160 resulted in the highest values and B210–B310 in the lowest values, whereas plant height consistently decreased with increasing BPFD (Figure 1). *2.1. Experimental Data—Plant Scale* Biomass and leaf area per plant showed similar differences among the six light treatments with a BPFD of 60, 110, 160, 210, 260 and 310 μmol m<sup>−</sup><sup>2</sup> s<sup>−</sup><sup>1</sup> (B60**–**B310). The treatments B110**–**B160 resulted in the highest values and B210**–**B310 in the lowest values, whereas plant height consistently decreased with increasing BPFD (Figure 1).

**Figure 1.** Final plant height (**A**), biomass (**B**) and leaf area (**C**) under different blue photosynthetic flux densities (BPFD). Error bars indicate standard error of the mean (*n* = 8).

Plant height responded rapidly after beginning of the experiment and the differences between treatments became more pronounced over time with differences between the highest and lowest values of 34%, 46%, and 34% on day 9 and 77% 75% and 72% on day 23 for plant height, biomass, and leaf area, respectively (Supplementary Materials, Figure S1).
