Multi-U-shaped complex cathode air discharge lamp with cool end

The utility model relates to a lighting lamp, in particular to a multiple U-shaped compound cathode gas discharge lamp with cold end, which is characterized in that based on original U-shaped discharge tube structure, the lamp comprises a plurality of U-shaped lamps; each unit U-shaped lamp is communicated with each other by a glass tube; one to two ends are arranged near the hot cathode end of each U-shaped lamp; the cold end is connected with the intracavity of the lamp, and deviated from the discharge channel of the discharge tube; one group or more than one group of cold cathode and hot cathode are connected in parallel at the place of the hot cathode, which are combined into a compound cathode; the cold end is an L-shaped glass tube or a straight pipe shape glass tube; the compound cathode is integrated style or split style; a linear line or shaped opening is made at the center of the compound cathode; the cold end structure can be dual-way or unidirectional structure, and is connected with the lamp by i