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Da1KrayzieThug Reviewed by Da1KrayzieThug on . Glossary Of Lighting Terms Lighting Terms AVERAGE LIFE - The life expectancy of a lamp, based on laboratory tests. AMPERE (AMP) - The unit used to measure the strength of an electric current. ARC - The luminous discharge of electricity between two electrodes in HID lighting. ARC DISCHARGE - A transfer of electricity across two electrodes (anode and cathode), characterized by high electrode current densities and a low voltage drop at the electrode. Rating: 5