... for HID lamps3.Machine blowingWe manufacture borosilicate lighting glass shell, The total output of machine-blowing hard ... product, and has great competitive advantages in borosilicate glass areas.Useage: used for high pressure mercury light, ... lamp, street light ..Type:We make hard glass shells for in T type, BT type, ED type, TO type, so on.T37.5X180 ... after-sale service as our aim. glass tube bulb