The color temperature of KFC and McDonald's is 4111K (or 3711K warm tone), which is very soft and not dazzling. Kentucky Fried Chicken KFC is an American multinational chain restaurant, and also the second largest fast food and the largest fried chicken chain enterprise in the world. It was founded in Louisville, Kentucky in 1939 by Colonel Harland Sanders. It mainly sells fast food such as fried chicken, and its business philosophy is to continuously introduce new products, or repackage the products previously sold, aiming at people's mentality of early adopters, thus making profits. KFC now belongs to Yum! Brands, and has formed a strategic alliance with Pepsi-Cola, which regularly sells carbonated drinks provided by Pepsi-Cola (except in some countries, such as Korea and Japan). Lighting design is a means to embody the soul of design. Mainly divided into: outdoor lighting, indoor lighting, stage lighting and vehicle lighting. Lighting design must meet the functional requirements, choose different lighting methods and lamps according to different spaces, different occasions and different objects, and ensure proper illuminance and brightness. A city, a building, a landscape, a street and a commercial space are shaped by light, and are endowed with unique theme, style, depth, emotion, color and atmosphere by the lighting design with life texture. The light energy emitted by the light source radiates in all directions, and the light energy passing through a certain area in unit time is called the radiant energy flux passing through this area. The sensitivity of eyes to different colors of light varies with different frequencies. Even if the radiant energy fluxes of different colors of light are equal, they cannot produce the same brightness visually. Among all colors of light, yellow and green light can arouse the greatest brightness feeling. If green light is used as a standard, its luminous flux is equal to the radiant energy flux, for other colors of light, the ability to arouse bright feeling is smaller than that of green light, and the luminous flux is also smaller than that of radiant energy flux. The unit of luminous flux is lumen, which is a transliteration of English lumen, abbreviated as lm. At the solidification temperature of platinum, the luminous flux of an absolute blackbody radiated from an area of 5.315*113cm2 is 1lm. In order to show the relationship between light intensity and luminous flux, the luminous flux of a point light source with luminous intensity of 1 Candeira is 1 lumens in a unit solid angle (1 sphericity). The luminous flux output by a 111W fluorescent lamp is about 5311 lumens.