The Relationship Of Light Blocking and Football Lights Utilization Efficiency
Directory:
1. Setting Principle
2. Lamp Specifications and Calculation Outcomes
3. Data Analysis: The Effect of Obstacles on Efficiency
Blocks of various sizes will be arranged and positioned 1 to 2 meters away from the football lights to investigate how the presence or absence of these blocks affects illumination. All other factors, including football lights specifications and positioning, will remain constant.
1. Setting Principle
Establish a projection distance of 50 meters and place a blocker outside the main optical axis of the football lights (ensuring it does not obstruct light near the main optical axis) to assess the effect of the blocker on lighting. The football lights' height is 35.4 meters. Refer to Figure 9 for a diagram illustrating the setting principle.
Fig.9 Schematic for Block simulation calculation
The site measures 20m by 20m, with the lamp projected at a 45-degree angle. The camera is positioned 60 meters from the center of the site and 10 meters above the ground, while the maintenance factor is set at 0.8 based on a 4-point glare assessment.
This analysis focuses solely on the data and does not take into account any other reasonable requirements at this time.
2. Lamp Specifications and Calculation Outcomes
The specifications for the football lights are as follows:
- Upward light output ratio: 0%
- Downward light output ratio: 80%
- Total light output ratio: 80%
- Luminous flux of the light source: 200.000 lumens
- Power consumption: 2133 watts
- Half-intensity beam angle: 0° to 180° [2 × 7.9°]; 90° to 270° [2 × 12.7°]
- Color temperature of the light source: 5600K
- Color rendering index: Ra > 90
- Central light intensity: 4230 cd/1000 lm
The light distribution pattern used for the calculations is illustrated in Figure 10.
Fig.10 Schematic diagram of luminaire photometric
The result parameters of the simulation calculation are shown in Table 7.
Table 7 The impact of the barrier on the results
3. Data Analysis: The Effect of Obstacles on Efficiency
(1) Although the obstacle does not completely obstruct the light channel, it still results in a lighting loss of less than 20%.
(2) This loss primarily arises from the area outside the 1/2 light intensity beam angle, which still plays a significant role in illuminating the field and particularly benefits the audience seating on the opposite side, thus impacting the football lights' efficiency.
(3) The optimal scenario is to maintain a "clear" line of sight between the football lights and the field.
(4) When the football lights is activated, its surface brightness is extremely high. If a person looks directly at the lamp, the structure of the eye prevents them from seeing the background where the lamp is installed. Therefore, the notion that the horse track appears more attractive within the steel frame is incorrect, unless the observer is viewing the lamp when it is off during non-competition periods.
As a result, many horse paths in gymnasiums are positioned within the steel frame, leading to light loss. This loss is difficult to accurately predict during the initial design phase, which can create a significant gap between the expected and actual outcomes. Even if the issue is anticipated during design, it may necessitate the use of more football lights, increasing costs and decreasing efficiency. Additionally, the obstructed light can illuminate certain areas of the steel structure, creating irregular bright spots that detract from the visual appeal. Consequently, placing the horse path inside the steel frame not only fails to achieve the desired aesthetic but can also have negative repercussions.
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