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material composition

Materials used in lamps are strongly related to the physical and chemical requirements for efficient light production.

Filament Lamps (glass, filament and inert gas)

  • General Lighting Sources (GLS)
  • Halogen

There are a large variety of products in this group and their application is predominantly determined by such requirements as the amount of light needed, the direction of that light, the burning time of the lamp. When more light is required, the power of the lamp is increased. Application dependent aspects also contribute, e.g. reflectors and transformers to adjust voltage. The latter can vary as 12 Volt, 24 Volt or 240 Volt in case of halogen lamps.

Gas discharge Lamps (glass / quartz / ceramics, electrodes, mercury / sodium / metal-halide)

  • Fluorescent Lamps (low pressure)
  • Compact Fluorescent Lamps-integral (CFL-integral) (low pressure)
  • Compact Fluorescent Lamps-non-integral (CFL-non-integral) (low pressure)
  • High Intensity Discharge Lamps (HID) (high pressure).

The large range in gas discharge lamps offered to the market provides the client with a wide choice of products from which they can select the best performing lamp available for the application in question. For general lighting purposes fluorescent lamps offer the best economical choice for energy efficient, long life lamps with good colour rendition. The CFL has a similar physical construction as conventional fluorescent lamps with different geometry offering a much smaller size product. They are produced in two distinct variants. The CFL-integral, with integrated ballast, is a direct substitute for a GLS lamp since it has the same lamp cap and dimensions. The CFL-non-integral has a special socket termination and only fits in an appliance designed for this combination.

 

High Intensity Discharge (HID) lamps come in many types and are a class on their own. Usually they operate at high temperatures. These energy efficient products are mainly used for industrial or professional applications and outdoor lighting.

Components used in lamp construction are divide in three main categories, the lamp structure (lamp envelope, metal support parts, cap), electrical parts (electrodes, filaments, wiring, ballast) and lamp envelope additives (inert gas, getter, emitter, mercury, sodium, metal-halides, fluorescent powder).

The average material composition of lamps is presented in the following table. Within the HID lamps group there are many different lamp types. As example, a metal-halide lamp (MHL) is selected to represent indoor applications and a high-pressure sodium (HPS) lamp to represent outdoor applications.

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