We make hard glass glass bulb for HPS lamp, MH lamps glass shadehard glass bulb Usage: used for high pressure mercury light, ... pressure sodium lamp, street light.Type:We make hard glass for in T type, BT type, ED type, ... ,ED55,ED75,ED90,ED120,BT90,BT120Material: high borosilicate glass, hard glass We will carry out high quality, competitive price, ... after-sale service as our aim. hard glass shell