Samsung Galaxy S Lightray 4G R940 official Pictures. Samsung Galaxy S Lightray 4G R940 is a Smartphone of samsung. The Samsung Galaxy S Lightray 4G R940 Android Smartphone. Announced Aug 2012. Features 4.3″ Display, Exynos 3210 Chipset, 8 MP Primary Camera, 1.3 MP Front Camera, 1600 MAh Battery, 1.4 GB Storage. Samsung Galaxy S Lightray 4G R940 price starts.