Calculating the LED stadium lights for a professional football stadium involves several key factors to ensure proper illumination, uniformity, and energy efficiency. Here are the steps to calculate the necessary lighting:

1. Determine Lighting Requirements:
- Illuminance Level: For professional football stadiums, the recommended illuminance level is typically around 500 to 1500 lux for HDTV broadcasting.
- Uniformity: The lighting uniformity should be at least 0.7 to 0.8 to avoid shadows and ensure even light distribution.
- Color Temperature: A color temperature of 5000K to 6000K is usually preferred for sports lighting to mimic daylight conditions.
- Color Rendering Index (CRI): A CRI of 80 or higher is ideal to accurately render colors for players and spectators.

2. Field Dimensions:
- The standard dimensions for a football field are 105 meters (length) by 68 meters (width).

3. Lighting Layout:
- Number of Poles: Decide on the number of lighting poles. For professional stadiums, typically 6 to 8 poles are used.
- Pole Height: The height of the poles usually ranges from 30 to 50 meters.
- Placement: Ensure the poles are positioned to minimize shadows and provide uniform lighting across the field.

4. Calculate Total Luminous Flux:
- Total Luminous Flux (in lumens) = Illuminance Level (lux) × Area of the Field (square meters)
- Example: For 1000 lux on a 7140 square meter field: Total Luminous Flux = 1000 lux × 7140 m² = 7,140,000 lumens

5. Select LED Fixtures:
- Determine the lumen output per fixture. For instance, if one LED fixture provides 50,000 lumens, you will need:
- Number of Fixtures = Total Luminous Flux / Lumen Output per Fixture
- Example: 7,140,000 lumens / 50,000 lumens per fixture = 142.8 fixtures (round up to 143 fixtures)

6. Beam Angle and Distribution:
- Choose appropriate beam angles for the fixtures to ensure proper coverage and minimize light spillage.
- Use photometric analysis software to simulate and verify the lighting layout and ensure compliance with standards.

7. Power Consumption and Efficiency:
- Calculate the total power consumption based on the wattage of each fixture.
- Ensure the fixtures are energy-efficient and meet regulatory standards for power consumption.

8. Maintenance and Durability:
- Consider the maintenance requirements and durability of the LED fixtures, ensuring they are suitable for outdoor use and resistant to weather conditions, such as 3 years warranty, 5 years warranty, 7 years warranty, IP65, IP66 etc.

By following these steps and conducting detailed planning and simulations, you can accurately calculate and design the LED lighting system for a professional football stadium.