base case, except for the all case of brand B electronic ballasts.When the brand B electronic ballast is carefully considered, theobtained %THDihas a higher percentage change than that of thebase case; it is approximately 2–3 times; this indicates that in termsof the energy efficiency or energy saving, apart from consideringthe real power consumed, the harmonic reduction should be alsoconsidered.By considering Fig. 5, when the number of fluorescent T8 lampwith electromagnetic ballast is changed from 4 lamps to 10 lamps, itcan be observed that the voltage waveform and current waveformremain similar, but the current amplitude is increased. Comparedwith the current waveform in case of fluorescent T8 lamp withelectronic ballast, it can be seen that the current waveform con-tains harmonic components due to operating of switching devicesin electronic ballast. Based on a further analysis for the case of fluo-rescent T5 lamp with electronic ballasts, it can be clearly observedthat the current waveform in case of fluorescent T5 lamp with brandB electronic ballast is much more distorted when comparing withthe base case. By considering the other electronic ballast brands(E and P), it can be seen that the obtained current waveform has