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HIGH INTENSITY DISCHARGE LAMPS What are HID Lamps? High Intensity means a large amount of light is produced in a relatively small area, and Discharge means the light is produced in a gas arc and not a heated wire. All HID light sources require auxiliary electrical equipment: ballast, capacitators and ignitors. HID Lamp Gallery HID Lamp Base Gallery Click here to see our wide selection of HID Lamps! Click here to see our wide selection of HID Lamp Bases! Types of HID Lamps: These devices provide the proper electrical values for starting and operating HID Lamps. HID Lamps come in four varieties: High Pressure Sodium, Low Pressure Sodium, Mercury Vapour and Metal Halide. Metal Halide: Metal Halide lighting systems are growing in popularity and becoming the customers choice for lighting applications. These extraordinary new lamps offer consumers a wide range of product features such as: high energy efficiency, high colour rendering index, white light, long life and unique and stylish fixture designs for both indoor and outdoor applications. High Pressure Sodium: High Pressure Sodium lamps generate light by means of a sodium-mercury amalgam. Consumers are attracted to these lamps because of their low initial cost and energy efficiency. However, the colour of the light is yellow/orange and the colour rendering index is low. Low Pressure Sodium: Low Pressure Sodium lamps operate at low pressure in which vaporized sodium produces an electric arc. Light produced by the low pressure method does not offer high colour rendering because of the yellow, monochromatic light emitted. Mercury Vapour: Mercury Vapour lamps are the oldest of HID lamps. Because of their dull blue-white light they offer a low colour rendition. In spite of these disadvantages, the lamp is still widely used because of its initial cost, low maintenance and long life.