**7. Conclusions**

In the present study, we collected information pertaining to the control of local and national light pollution in Korea and four Chinese cities. We found that although both countries have relatively robust light pollution control policies, there are still many problems that need to be addressed. For instance, local light pollution laws in China seem too simple and lack specificity for a complex issue such as light pollution. For example, many local light pollution policies in China do not provide lighting standards for decorative and advertisement lighting, and ye<sup>t</sup> these two forms of artificial lighting are major contributors to local light pollution. The issue of generalization is also seen in light pollution policies in Korea; for example, the lighting limits provided for advertisement lighting in the Korean "Light Pollution Prevention Law" are intended to control luminance levels emitted by a single signboard instead of the net luminance radiated by all the signboards on a building façade. As such, given that the two countries share a similar socio-economic background, they can learn from each other's specific

approaches to tackling light pollution. The current study, therefore, provides the basis for discussing this exchange of ideas between Korea and China on the issue of light pollution control and policy.

**Author Contributions:** Conceptualization, methodology, resources, compare analysis, W.G., J.N. and K.G.; investigation, writing—original draft preparation W.G.; writing—review and editing, supervision, J.N. and K.G.

**Conflicts of Interest:** The authors declare no conflict of interest.
