*3.2. Person Correlation Results*

The next step was determining the Pearson correlation level with the coefficient *ρ* supported by the statistic test *pvalue* using the equations in Section 2.4. The evidence for Pearson correlation with intensity, R, G, B, W, and frequency was sufficient as *pvalue* ≤ 0.05, but the duty correlation was unreliable because *pvalue* > 0.05. Thus, duty cycle was the first variable eliminated (Table 3).

**Table 3.** *ρ* and *pvalue* correlation with energy consumption per input variable.


Figure 4 shows a correlation heat map of the input variables and the energy consumption output to identify the strongest correlations graphically. There is a lower correlation where the graph color is darker.

**Figure 4.** Pearson correlation heat map results.
