In order to solve this problem, use the following equations and steps shown: \begin{align} &\cssId{Step1}{E_{LED} = \frac{P_{LED}}{P_{VSAP}} · E_{VSAP}}\\[3px] &\cssId{Step2}{E_{LED} = 308 · 100W · 365·11·3600s=1603·10^3 MJ}\\[3px] &\cssId{Step3}{c_{save} = c_{VSAP} + c_{mant} - c_{LED} = c_{VSAP} + c_{mant} - c_{elec} · E_{LED} }\\[3px] &\cssId{Step4}{c_{save} = 24,842€ }\\[3px] \end{align}