## 3 Results and Discussion
### Anova Analysis
Thereafter, conditions that will promote stem growth should be particularly well-tailored to match all these competitive effects. Finally, the estimated effect size of _Water_ (Figure 10) indicates that the variables that should be emphasized to reduce its consumption are _HR:DB_, as it affects Water negatively, and its interaction with _White_ LED, for the same reason. However, _Distance_ must be severely reduced to decrease the Water consumption as well. This means that the employment of the light combination LR22 or LR12 at a distance equal to 60 cm should be preferable, as argued considering Figure 6c,d. As shown from these results, it is hard to establish a light condition that can be favorable for all the responses; in particular, is not clear if the overall influence of the white LED is beneficial or detrimental for the basil growth. As suggested in the literature, possible overlapping effect of the white LED with the others LED light that are more absorbable by the plants can have a negative effect on the plants' growth, but this effect depends on the parameters that are investigated [24]. Thereafter, it is necessary to collect all the derived models in one, called desirability function, by balancing them, considering each goal and importance with respect to the overall aim of the research. The desirability function conditions employed in the present work were shown in Table 10. Number of plants and days for germination responses were discarded from this part of the analysis due to theirs poor R\({}^{2}\) and Pred-R\({}^{2}\), indicating a low fitting and predictive power. The other responses were evaluated through the objectives in Table 10 with the aim to promote the overall plants' best growth with the most possible restrained amount of water. As shown in Figure 11, results of the desirability function calculation indicate that the light conditions that better fit the overall objectives indicated in Table 10 are a distance equal to 60 cm and the employment of the LR22 light combination (green area of the graphs). This condition has a desirability value equal to 0.618956 as shown in Figure 11a, and it is the highest one of the overall light conditions investigated in this study. This result agrees with the fact that most of the responses are strongly promoted by a distance equal to 60 cm and the fact that water consumption is reduced avoiding white LEDs light. In addition, this result agrees with previous literature on hyper red effect on basil growth [40; 41] However, the blue area of the graphs indicated all the lights combinations that should be avoided, to promote the basil growth. By employing or not white LED, this area changes; without white LED (Figure 11a), the blue area of the graph in mainly due to distance > 75 cm, and by employing white LED (Figure 11b) this area results wider, as the interaction of distances between 65-78 cm and hyper red prevalence in proportion to deep blue (LR 12). \begin{table}
\begin{tabular}{c c c} \hline \hline
**Responses** & **Goal** & **Importance** \\ \hline Height & maximize & 4 \\ Wet mass & maximize & 5 \\ Dry mass & maximize & 4 \\ LAI & maximize & 4 \\ SLA & maximize & 5 \\ Number of leaves & maximize & 4 \\ Leaves wet mass & maximize & 3 \\ Stem lenght & maximize & 3 \\ Stem wet mass & In range & 3 \\ Stem dry mass & In range & 3 \\ Stem diameter & maximize & 2 \\ Water & minimize & 5 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Desirability function conditions.