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 lig...