The formula to calculate Average Illuminance (\(E_{av}\)) is:

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

Where:

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