Do you know what this "sea of light" is for? It is necessary for dragon fruit, which is widely grown in the tropics, to accumulate sugar.
About 'Go! Hainan' series
Featuring unspoiled tropical rain forests, sandy beaches, and rich culture, Hainan Province is the southernmost island province of China. Nicknamed "China's Hawaii," Hainan is on its way to becoming a free-trade port. The "Go! Hainan" series takes you on a new journey to explore the fantastic island and its underwater world.