The coverage area of a lighting unit in terms of square feet can vary depending on several factors, including the specific floodlight model, the beam angle, and the desired level of illumination. However, I can provide you with some general information that can help estimate the number of light units you might need for your outdoor landscape lighting.
Determine the desired light intensity: Consider the level of brightness or illumination you want for your facade. This is typically measured in foot-candles (fc) or lux. Foot-candles are more commonly used in the United States, while lux is the international standard. Let's assume you want to achieve an average of 10 foot-candles or 100 lux on the facade.
Find the beam angle of the floodlight: Floodlights come with different beam angles, such as wide flood (around 120 degrees) or narrow spot (around 10-30 degrees). Determine the beam angle of the floodlight you plan to use.
Estimate the coverage area: With the desired light intensity and the beam angle, you can estimate the coverage area of each floodlight. This estimation depends on the manufacturer's specifications and the specific light unit you choose. As an example, let's assume that a floodlight with a 120-degree beam angle can cover an area of approximately 100 square feet with the desired light intensity.
Calculate the number of light units needed: Divide the total area you want to cover (30 feet wide by 50 feet tall = 1,500 square feet) by the estimated coverage area per floodlight (100 square feet per floodlight). In this case, you would need approximately 15 floodlights to cover the entire facade evenly.
Keep in mind that this is a rough estimation, and it's always recommended to consult the specifications provided by the manufacturer for the specific floodlight model you intend to use. Additionally, considering the height of the facade, you may need to consider mounting options, the angle of the floodlights, and any potential obstructions that could affect the coverage area.