Detailed Product Description Hard glass bulb Features:1) Made of borosilicate glass 4.0 2) 4 blowing machines, annual output of 36 million pieces of lighting bulbs 3) 4 production lines, annual output of 540 tons for lighting tube 4) Lighting tubes: horn-shape and vent-pipe 5) Lighting bulbs: a) Mercury lighting: BT70, BT75, BT80, BT90, BT120 b) Sodium lighting: BT62, T37.5?80, T37.5?08, T46?20, T46?65,T46?90 c) Halogen lighting: ED55, ED75, ED90, ED120