Abstract
The general objective of this work consists in studying the influence of the current pulses duration on the electric and photometric behaviour of the gas-discharge high pressure mercury vapour lamps, intended particularly for the water treatment. With this intention we carried out a feeding system allowing providing the lamp a crenels of current with variable amplitude and duration of pulses. In this work we focused on the presentation of the feeding system carried out. We also present experimental measurements (voltage-arc, current, power, conductance and the luminance) of a 400W high pressure lamp coupled to its electronic power supply. These electric and photometric results highlight and evaluate the effectiveness of the currents pulses duration on the behaviour of the lamp conductance and the luminance of visible radiation.