*3.1. Effect of Light Quality on Plant Growth and Morphology*

In this study, the effects of blue, red, and far-red light spectra are mainly investigated. Results show that the plants' growth is substantially different under the grow-tent environment, such as post hoc analyses revealed that the W\*-illuminated tent produced the lowest average fresh biomass, 22.08 g, which was considerably lower than that produced by the BRF\*-illuminated tent, 40.58 g, and the BR\*-illuminated tent, 31.58 g, as shown in Figure 4A.

We have identified the best LED wavelength bands required to significantly improve the growth rate of sweet basil (*Ocimum basilicum* L.) plants in grow tent environments by optimizing the LED spectrum illuminating the plants. Post hoc comparisons using the Tukey's–Kramer HSD tests indicated that the W\*-illuminated tent produces the lowest mean dry biomass (M = 1.73 g; standard deviation, SD = 0.20 g), and this is substantially lower than that produced by the BRF\*-illuminated tent (M = 3.49 g; SD = 0.62 g), and the BR\*-illuminated tent (M = 2.62 g; SD = 0.93 g), as shown in Figure 4B.
