Microwave sulfur lamp includes microwave source of transmitting out microwave, bulb shell made from quartz, and mesh cover sheathed outside the bulb shell. Outline of the quartz bulb is columned, and the bulb is on the same axis of the said mesh cover. Thus, field intensity coupled from energy of microwave sent from microwave source is distributed on coaxial line of the mesh cover. Outline of the bulb is consistent to outline of inner distribution of field intensity so as to absorb energy of microwave as more as possible. The invention enhances capability of lamp to absorb energy coupled to microwave so as to raise use ratio of energy and increase optical efficiency. |