Title :
Influence of frequency and current waveform on low pressure sodium lamp operation
Author_Institution :
Escola Politecnica, Sao Paulo Univ., Brazil
Abstract :
Efficient light production in AC supplied LPS (low-pressure sodium) lamps is strongly dependent on plasma conditions within the complete half-cycle. Significant luminous efficacy gains are obtained with sinusoidal currents of hundreds of kilohertz or rectangular current form at lower frequencies. Measurements of light emission from a 18 W LPS at several operating conditions, reported in this paper, can be useful to establish a compromise between supply frequency and current waveform shape for electronic ballast design
Keywords :
lamp accessories; metal vapour lamps; optical variables measurement; power supplies to apparatus; sodium; 18 W; AC supplied low-pressure sodium lamps; current waveform; current waveform shape; efficient light production; electronic ballast design; frequency; light emission measurements; low pressure sodium lamp operation; luminous efficacy gains; plasma conditions; rectangular current; sinusoidal currents; sodium depletion; sodium migration; supply frequency; Current measurement; Current supplies; Electron tubes; Electronic ballasts; Frequency measurement; High intensity discharge lamps; Infrared heating; Plasma measurements; Production; Shape measurement;
Conference_Titel :
Industry Applications Conference, 1999. Thirty-Fourth IAS Annual Meeting. Conference Record of the 1999 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-5589-X
DOI :
10.1109/IAS.1999.800013
