Are cities under bright lights more innovative? Evidence from China

The prosperity of the nighttime economy is an important criterion for measuring urban development. Based on regression analysis of data from 330 prefecture-level cities in China, this study explores the potential link between urban lighting and urban innovation capacity. The results show that the relationship between nighttime light intensity and urban innovation capacity follows an inverted U-shaped curve. Moreover, urban nighttime light stability moderates the above relationship. In addition, the heterogeneity analysis indicates that low population density, weak economic foundation, and high administrative grade weaken the relationship between lighting intensity and urban innovation capacity. Finally, the mechanism analysis suggested that the inverted U-shaped relationship between urban lighting and innovation capacity may be caused by the encroachment of the service industry and the loss of urban attractiveness. By exploring the proxy effect of nighttime lighting on urban innovation, this study reveals the imbalance between extrinsic image and the intrinsic capacity of cities, which not only extends the research on urban construction and development but also provides guidance for local governments concerning how to achieve all-round coordination of cities.