
Sustainable Lighting Technology 28-11
can be approximated as a resistor and the lamp (power) factor approaches unity. ere is no ickering
eect and the stroboscopic eect in the light output and the light lumen can be improved. However, the
operation of high-pressure HID lamps with high-frequency current waveforms is oset by the occurrence
of standing pressure waves (acoustic resonance). is acoustic resonance can lead to changes in arc posi-
tion and light color or to unstable arcs. Instability in the arcs could sometimes cause the arcs to extinguish.
e common explanation for acoustic resonance is that the periodic power input from the modulated ...