Answer:
artificial light
Step-by-step explanation:
Most stores, no matter the type of the merchandise they sell, use artificial light. Although natural light (sun) is always present, it is not enough to cater to the lighting needs of a business.
They need to showcase their goods in the best manner possible. Due to common building constraints, natural light is never enough, as some corners of the shop will remain shaded.
Businesses use LED or other sorts of artificial lighting in order to make the shopping experience pleasant.