Long life span eefl, 50000hrs. 2. Features of EEFL To avoid negative impedance of common gas charge lamp, EEFL external electrode allow high frequency voltage function via capacitance coupling. As a result of this, parallely connected EEFL can be driven by one ballast. EEFL is able to get long lifetime and high lighting stability, which is because its special working principle will cause much less heat than CCFL. 3. Applications(EEFL) Applications(EEFL) large area LCD screen Large advertisement lighting box