ABSTRACT
For decades, improvement in energy e¢ciency has been the main focus in many energy-conversion applications including lighting. že continuous increase in luminous e¢cacy of discharge lamps such as the introduction of T5 ¹uorescent lamps and the arrival of new high-brightness light emitting diodes (LEDs) marked signiŸcant progresses in light sources. že introduction of electronic ballasts and new low-loss magnetic ballasts has resulted in the progressive elimination of poor-quality ballasts. že Ÿrst decade of the twenty-Ÿrst century is the period during which the electronic ballast technology reached maturity [1]. že proposal of replacing incandescent lamps with energy-saving lamps by many governments has created new opportunities to new lighting technology and market.
