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Direct Current in Fluorescent Lighting Installations Department of General Electrical Engineering, Kaunas University of Technology, Lithuania Valdas Pakénas Albertas Mikulionis Ramunas Balsys Department of General Electrical Engineering, Kaunas University of Technology, Lithuania Abstract Electric energy costs jumped up several times during the last years in Lithuania. It is necessary to save electric energy in industry commercial buildings, schools, offices, residences, etc. Electric energy for lighting purposes can be saved by improving the illumination quality. The lamp's flicker factor is one of the illumination quality factors. One of the ways for reducing the lamp's flicker is to employ the direct current in fluorescent lamps. The paper presents the principle of the direct current control in fluorescent lamps without ordinary ballast. Dimming of lamps including their switch-off and switch-on can be carried out by means of the light sensor, as well as, by using programmed or manual control devices.
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