Multi-electrodes double tube fluorescent lamp

A multi-electrode double tube fluorescent lamp, comprising:

• an outer glass tube;
• an inner glass tube concentrically formed in the interior of the outer glass tube;
• a discharge space formed between the outer glass tube and the inner glass tube;
• a pair of first external electrodes formed at two ends of the inner glass tube;
• second external electrodes formed at an inner wall surface of the inner glass tube in a longitudinal direction, wherein said second external electrodes are arranged in a radial shape in a direction vertical with respect to the longitudinal direction of the inner glass tube for thereby implementing a multiple electrode structure, with power being supplied so that the opposite poles are formed between neighboring electrodes;
• a first power source connected with the first external electrode and guides a discharge of the longitudinal direction of the double tube florescent lamp;
• a second power source connected with at least one of the second external electrodes and guides a discharge in a direction vertical with respect to the longitudinal direction of the double tube florescent lamp, wherein the direction of the plasma generated by the first power source and the direction of the plasma generated by the second power source are vertical to each other;
• and
• third external electrodes formed along an outer surface of the outer glass tube and connected with the second power source, wherein said third external electrodes are formed in a radial shape in a direction vertical with respect to the longitudinal direction for thereby implementing a multiple electrode structure, with power being supplied so that the opposite poles are formed between the neighboring electrodes.