High Intensity Discharge Lamp Operation

In the past few years electronic ballasts have been developed primarily for metal.

High intensity discharge lamp operation. Compared to other lamp types relatively high arc power exists for the arc length. Types of high intensity discharge lamps mercury vapor lamps shortwave uv a result of the decay of mercury atom electrons from an excited to a stable state is readily transmitted through the inner quartz tube but is virtually blocked by the outer glass envelope during normal operation. The circuit diagram for the various types of hid ballasts are shown below. 32 4 1 high intensity discharge lamps.

High intensity discharge lamps 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. The provisions of this section apply to any high intensity mercury vapor discharge lamp that is designed intended or promoted for illumination purposes and is manufactured or assembled after march 7 1980 except as described in paragraph d 1 ii of this section. They are available with operation powers between some tens of watts and tens of kilowatts. At the time the lamp was filled with air but it was later discovered that the light output could be increased by filling the lamp with noble gases such as neon xenon argon or krypton.

The luminous efficacy of an hid lamp. The basic operation principle of a metal halide lamp is that of a gas discharge lamp due to an electric discharge one generates a plasma which emits light in the form of spontaneous emission after excitation of atoms or ions e g. 1 high intensity mercury vapor discharge lamp means any lamp including any mercury. The invention of the gas discharge lamp is generally credited to francis hauksbee an english scientist who first demonstrated the technology in 1705.

They are called high intensity discharge lamps hid lamps. Hid lighting sources include mercury vapor low. A hid ballast hid stands for high intensity discharge is a device that is used to control the voltage and arc current of high intensity discharge lamps during their operation. The hid lamps offer higher luminous efficacy higher reliability longer life and greater styling flexibility than the traditional halogen lamps 17 18.

The plasma also contains a metal vapor which is formed by evaporation and. The noble gas enables the arc s initial strike. High intensity discharge hid lighting sources are important for commercial industrial and outdoor locations such as high bay parking lot and street lighting. High intensity discharge hid lamps have started to appear in automobiles as low beam headlights and fog lights.

There can also be a significant amount of thermal radiation. This tube is filled with noble gas and often also contains suitable metal or metal salts. Some lamps are optimized for particularly high volumetric emission densities. High intensity discharge lamps are common for projectors and other high radiance applications.