HID LIGHTING SYSTEM

摘要

A low-cost HID lighting system (100) comprises: - an HID lamp (1) having an aspect ratio less than 6; and - a resonant electronic driver (10) for driving the HID lamp, the driver being designed for providing alternating current to the lamp and including a control device (30) for determining the current frequency. The lamp has a frequency spectrum containing at least one arc-shaping acoustic resonance frequency as well as unwanted acoustic resonance frequencies. During normal operation, the lamp is provided with frequency-modulated lamp current so that the lamp current has a relatively broad power spectrum within a range between kHz and 200 kHz, so that said arc-shaping acoustic resonance is triggered while said unwanted acoustic resonances are avoided, irrespective of lamp orientation.