Figure 12.

Overall illumination with LEDs tilting for $s_i=1\forall i$, ${\mathrm{\Phi }}_{1/2}={20}^0$, $\epsilon =0^0$. (a) $\rho ={20}^0$, $\epsilon =0^0$. (b) $\rho ={40}^0$, $\epsilon =0^0$. (c) $\rho ={60}^0$, $\epsilon =0^0$. (d) $\rho ={80}^0$, $\epsilon =0^0$.