the electrodes, and once the arc is established, the voltage across the lamp drops to a given value (typically 20 to 50 volts) while the current increases to a level required to maintain the arc at optimal brightness. As the lamp ages, its efficiency declines, due to electrode wear, resulting in a reduction in visible light and an increase in the amount of waste heat. The lamp's end of life is typically indicated by an LED on the unit or an onscreen text warning, necessitating replacement of the lamp unit.

Continued operation of the lamp