Madrid-Barajas Airport is the main international airport of Madrid, the capital of Spain. It is located in the Barajas district about 12 kilometers northeast of the center of Madrid. Since its completion in 1928, Barajas Airport has been the center of European shipping. It is not only an important gateway from the Iberian Peninsula to Europe and the rest of the world, but also an important transfer point between Europe and Latin America. In 2006, the total passenger throughput of Madrid Airport exceeded 45 million. In 2011, it became the fifteenth largest airport in the world and the fifth largest airport in Europe (after London Heathrow Airport, Paris Charles de Gaulle Airport, Frankfurt International Airport, Amsterdam Schiphol Airport).

The airport has four terminals, T1, T2, T3, and T4. T4 was officially put into use on February 5, 2006. This terminal was designed by the well-known architect Antonio Lamela and Designed by Richard Rogers, it was immediately awarded the RIBA Striling Prize by the Royal Institute of British Architects (RIBA) in 2006. Considered one of the most beautiful terminals among modern airports in the world.

T4 terminal adopts a modular design, with each module measuring 18x9 meters. The entire building is assembled with prefabricated steel structural components, so it can be expanded at a very low cost if necessary in the future. This kind of prefabricated module design greatly saves construction time and accelerates the entire construction process. Many of the key components were designed and manufactured specifically for this project, such as the biofilm exhaust system, floor flushing system, and Vietnamese hat-style lighting. The highlight of the entire project is the "corrugated roof", which is supported above the building and is decorated with thin bamboo slats below. The entire roof is supported by a steel frame structure and is painted in a rainbow of colors.

In the lighting optimization of airport terminals, the use of LED floodlights is almost indispensable. Indirect lighting is created by it (high-power floodlights are installed on the ceiling of the building structure and illuminate diagonally upward. The ground is illuminated by reflected light from the ceiling). Of course, considering the sole use of floodlights to illuminate large spaces such as check-in islands and central halls with indirect lighting, the utilization rate of light is low, the light in the space is relatively dim, and the illumination is not sufficient. Therefore, it is often "improved" to a mixed lighting (i.e. direct lighting + indirect lighting) solution. The direct lighting fixtures represented by LED downlights are combined with the indirect lighting of floodlights, which saves the dim light situation and adds a lot of Beauty.

The LED floodlights in Madrid Airport are a "highlight" of the airport. Through indirect lighting, they create a "light-not-visible" light environment. At each bifurcation of the Y-shaped steel structure 18 meters apart, three 500W floodlights are installed to illuminate the ceiling above and reflect to the ground, providing passengers with a softer light environment; in addition to LED projection In addition to lights, there are many other types of LED lighting fixtures that are also used in airport lighting optimization. It is precisely because of their combined effect that airports are made one after another full of beauty and efficient operation.