China's Shenzhou-10 manned spacecraft successfully completed an automated docking procedure with the orbiting Tiangong-1 space module on June 13. The two lights emitted from Shenzhou-10 viewers before TV saw provides illumination for optical sensor used for docking control. And the LED spotlight illuminating the docking is developed by Shanghai Institute of Technical and Physics of CAS.

During the rendezvous and docking process on June 13, the LED spotlight installed on Shenzhou-10 emits two lights with the luminous efficacy of 100 lumens / watt to provide lighting for optical sensor used for the docking control, so that it can aim at the target on Tiangong-1, in order to precisely complete the docking.

According to the introduction from Zhang Tao, a researcher from Shanghai Institute of Technology and Physics of Chinese Academy of Sciences, China is the first country to apply LED light as the lighting device in the spacecraft cabin; LED floodlighting has been used for the extravehicular lighting from Shenzhou-7 in China.