HID or High Intensity Discharge lights are high definition lights
used mostly in high-ceiling places like warehouses and also in large
outdoor areas like parking lots and big arena's. HID lights came into
existence about 64 years ago when mercury vapor lamps developed. Light
in HID lamps is usually provided by few high-wattage lamps or by many
low-wattage lamps. The first approach minimizes electricity consumption
whereas the second usually gives more uniform illumination.
HID lights are easily available and very easy to fit as well. So using them is not a problem. There are three general types of HID lights available: Mercury Vapor, Metal Halide and High Pressure Sodium's. There are also different variations within each type. Metal Halide's and High Pressure Sodium's are recent improvements on the Mercury Vapor design. However, all HID lights must be used with current-limiting ballast's. Most are position-sensitive; some are designed for base up use, some for base down and some horizontal. In spite of these differences, all make use of an inner bulb called the arc tube made of a material like quartz or ceramic that can withstand the extreme hot temperature of the arc.
All HID lights have an outer glass bulb. In some models this bulb is left clear and in some it is internally coated with luminescent phosphor. Hence the terms clear and coated are often associated with them. All of these lights need a warm up period before actually producing their full light output and they need what is called a "re-strike" time after a power interruption before they can come back on. It has been argued that there are certain safety concerns with HID lights. The rupturing of the arc tube is at the top of the list of concerns as it can cause the outer bulb to break and hot particles to go flying risking fire and harm to people. Breakage of the outer bulb while the arc tube is being operated is another concern as it causes exposure to excessive ultraviolet radiation's from the lamp. However, appropriate fixtures can eliminate these concerns.
HID lights function when the gases inside the fused alumina tube are heated to the point of evaporation. Tungsten electrodes are kept in the alumina tube, and when the metal elements begin to heat up, they strike the tungsten electrodes, creating an arc of light. Tungsten is a chemical element that is known for its high melting point and robust physical characteristics. It is used widely in electrical applications like lighting because of these properties. It is a hard, non-alloy metal that ranges in color from steel gray to tin white. It is shaped, or "drawn" into the very thin metal wires you see inside a light bulb.
Other than being useful in places that require high intensity lights to cover large areas, HID lights are also used in smaller areas such as department stores, houses and open areas like gardens. They can also be fixed on cars and bikes for more visibility which is very essential for driving. These lights have even been used for airbus 380- super jumbo airplane, pointing out that they are extremely useful and efficient.
HID lights are easily available and very easy to fit as well. So using them is not a problem. There are three general types of HID lights available: Mercury Vapor, Metal Halide and High Pressure Sodium's. There are also different variations within each type. Metal Halide's and High Pressure Sodium's are recent improvements on the Mercury Vapor design. However, all HID lights must be used with current-limiting ballast's. Most are position-sensitive; some are designed for base up use, some for base down and some horizontal. In spite of these differences, all make use of an inner bulb called the arc tube made of a material like quartz or ceramic that can withstand the extreme hot temperature of the arc.
All HID lights have an outer glass bulb. In some models this bulb is left clear and in some it is internally coated with luminescent phosphor. Hence the terms clear and coated are often associated with them. All of these lights need a warm up period before actually producing their full light output and they need what is called a "re-strike" time after a power interruption before they can come back on. It has been argued that there are certain safety concerns with HID lights. The rupturing of the arc tube is at the top of the list of concerns as it can cause the outer bulb to break and hot particles to go flying risking fire and harm to people. Breakage of the outer bulb while the arc tube is being operated is another concern as it causes exposure to excessive ultraviolet radiation's from the lamp. However, appropriate fixtures can eliminate these concerns.
HID lights function when the gases inside the fused alumina tube are heated to the point of evaporation. Tungsten electrodes are kept in the alumina tube, and when the metal elements begin to heat up, they strike the tungsten electrodes, creating an arc of light. Tungsten is a chemical element that is known for its high melting point and robust physical characteristics. It is used widely in electrical applications like lighting because of these properties. It is a hard, non-alloy metal that ranges in color from steel gray to tin white. It is shaped, or "drawn" into the very thin metal wires you see inside a light bulb.
Other than being useful in places that require high intensity lights to cover large areas, HID lights are also used in smaller areas such as department stores, houses and open areas like gardens. They can also be fixed on cars and bikes for more visibility which is very essential for driving. These lights have even been used for airbus 380- super jumbo airplane, pointing out that they are extremely useful and efficient.
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