The formula to calculate lumens (\(L\)) is:

\[ L = \frac{E_{av} \times L_{room} \times W_{room}}{0.32} \]

Where:

• \(L\) is the lumens (lm).
• \(E_{av}\) is the average illuminance in lux (lx).
• \(L_{room}\) is the length of the room in meters.
• \(W_{room}\) is the width of the room in meters.