This document provides information about HID luminaires, including how they work by producing light through an electric arc passing through gas between two electrodes. It discusses quartz metal halide lamps, their typical uses and specifications like wattage and lumen output. It also covers metal halide lumen depreciation, probe start vs pulse start operation, warm-up times, and quartz metal halide and high pressure sodium ballasts. Backup options for HID luminaires like HID backup ballasts, quartz restrike emergency lighting, and battery backup emergency lighting are also summarized.