Question 1

What is the maximum effective projected area of the lamp?

Accepted Answer

The maximum projected area of the luminaire multiplied by the resistance coefficient of the luminaire can be used to determine the maximum EPA of the luminaire, that is, maximum EPA = (maximum projected area) x (drag coefficient). If the lamp is seen as a cuboid, the area of the side with the largest area (usually the light-emitting surface) is the largest projected area, and multiplied by the drag coefficient is the largest effective projected area.

PS: Dynamic drag coefficient (DC) is a number, it is a dimensionless constant, its value is closely related to the shape and size of the object.

Question 2

What is EPA's Wind Rating?

Accepted Answer

High wind speeds can exert enormous forces on light poles and light fixtures, potentially causing structural damage or pole collapse, resulting in property damage, interruption of lighting service, and safety risks to pedestrians and vehicles. EPA wind ratings refer to the ability of light fixtures and light poles to withstand wind in windy conditions. For street lights (installation height is generally below 15 meters), we generally consider the wind resistance of lamps and light poles at a maximum of V= 52 m/s (188 km/h). In this case, design and install outdoor light fixtures and light poles to withstand local wind conditions to ensure longevity and safety.

Question 3

What does EPA mean in light poles?

Accepted Answer

Effective projected area (EPA) is a way to measure the strength of a light pole. It refers to the total surface area of items (light fixtures, mounting brackets, other infrastructure, etc.) that a pole can support at a given wind speed.

To calculate your light pole’s total EPA, use this formula:

(EPA of light fixtures X quantity of light fixtures) + (EPA of the brackets X quantity of brackets) + (EPA of other equipments* X quantity of equipments)

For example, we are going to install 4 pieces ZGSM-FL07-400XL with dimension(FPA) = 1.66*2.10 = 3.486 ft2.

Total EPA for luminaires and arms = 3.486 * 1.2 * 4 = 16.7 ft2.

Total weight of luminaires and arms = 26.5 * 4= 106 lbs.

And maximum allowable EPA of pole = 20 ft2; Maximum allowable weight of pole = allowable EPA x 30 = 20 x 30 = 600 lbs. Because the maximum allowable EPA and weight of pole are greater than the total EPA and weight of luminaires, the pole selection is appropriate.

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Effective projected area and static load test – outdoor luminaires

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LED Street Light

Solar Street Light

Led Flood Light

Solar Flood Light

LED High Bay Light

High Mast Light

LED Traffic Light

LED Tunnel Light

LED Garden Light

LED Canopy Light

Led Bollard Light

Lighting Accessories

Smart Systems

Simulation Design

Smart Financing