How to calculate EPA?

What is EPA?

Effective Projected Area (EPA) is a coefficient used by the lighting industry to determine how much force a luminaire will apply to the mounting brackets or pole at a given wind velocity. This value is used in combination with a luminaire’s weight to determine the mounting requirements for a particular application1.

To determine the EPA of a luminaire, the frontal projected area is multiplied by the drag coefficient of the luminaire. The formula for calculating EPA is: EPA = (Frontal Projected Area) x (Drag Coefficient)1.

What is FPA?

The Frontal Project Area (FPA) is the maximum, achievable cross-sectional area of the luminaire and its mounting as installed. This is measured in square feet (ft2). The Drag coefficient (DC) is a number that aerodynamicists use to model all of the complex dependencies of drag on size and flow conditions1.

For example, to calculate the EPA for the S6 Series flood light, you would first calculate the Frontal Project Area (FPA), which is front cross-sectional area including the body, yoke, and caps = 2.09 ft2. Then you would assume a Drag Coefficient = 1.20 (flat plate area). Finally, you would use the formula EPA = (Frontal Projected Area) x (Drag Coefficient) to calculate EPA = 2.09 x 1.20 = 2.51 ft2

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