Abstract: The performance analysis of a blocking oscillator used in a low voltage fluorescent lighting was carried out. Javelin fluorescent tube with voltage rating of 12 V and power rating of 8 W and with dimensions of (370�45) mm was used. The performance analysis was carried out to determine the time constant, the pulse duration and the efficiency of the blocking oscillator as well as the turns ratio of the pulse transformer used. Measurements were taken using multimeter and oscilloscope. The results obtained showed that the time constant is 40 �s, the pulse duration is 16 �s, the efficiency is 58.2% and the turns ratio of the pulse transformer is 2:1 at the primary (collector) and secondary (base) and 1:7 at the primary (collector) and tertiary (high voltage) windings. From the results obtained, the efficiency is found to be low and the pulse duration is within the acceptable value of between 0.05 �s to 25 �s specified for blocking oscillators.