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In a metal halide light, the electricity heats a metal filament to a high temperature creating an extremely bright light. Metal ions burn off. A gas of the halide group (chlorine, bromine, iodine) reacts with the metal ions that have burned off and redeposit them on the filament. Because the filament is constantly being rebuilt, it can be brighter than a regular light bulb. Also it heats the gas to the point where the gasses give off light. So both the filament and the gasses give off light.

With a Mercury vapor light, mercury vapor is heated until it gives off ultraviolet light. The filament only serves to heat the mercury. It does not give off light. This light is used to excite phosphrus and other chemicals on the edge of the bulb. Those chemicals glow in the visible light spectrum. As a result, they illuminate.

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Which light is brighter Metal Halide or mercury Vapor?

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Where can I get more information online about metal halide street lights?

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What are HID lights?

There are four types of HID lights Metal Halide, High/Low Pressure Sodium, Mercury Vapour, Zenon. Common uses include Street lighting, car head lights, sports field lighting, fish tank lighting. HID stands for high intensity discharge.


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Metal halide lights are available in many shapes, sizes and specifications at home furnishing stores including Home Depot and Lowe's or online at Buy Lighting and Venture Lighting.


What is the difference between sodium vapor and mercury vapor streetlight?

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What does a metal halide light do to a plant?

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