Type of lamp used in many indoor grow rooms, High-Intensity Discharge (or HID) lamps are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. Various types of chemistry are used in the arc tubes of HID lamps, depending on the desired characteristics of light intensity, correlated color temperature, Color Rendering Index (or CRI), energy efficiency, and lifespan.
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