... .Used for HID lamps3.Machine blowing We manufacture borosilicate lighting glass shell, The total output of machine-blowing hard bulbs, ... and quality of product, and has great competitive advantages in borosilicate glass areas. Useage: used for high pressure mercury light, metal halide ... pressure sodiun lamp, street light ..Type:We make hard glass shells for in T type, BT type, ED type, TO type, so ...