High pressure mercury lamps possess the property which applies to all gas discharge lamps, viz. the non-linear relation between the current through the lamp and the voltage across the lamp. Over a wide range, the lamp voltage V l is almost independent of the lamp current I l ; with increasing current the voltage decreases slightly for low loaded lamps and increases slightly for high loaded lamps (see Fig. 1.14).


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© N. V. Philips’ Gloeilampenfabrieken, Eindhoven (The Netherlands) 1965

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