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Common Lamp Types

Common Lamp Types

Incandescent
The incandescent light bulb, incandescent lamp or incandescent light globe makes light by heating a metal filament wire to a high temperature until it glows. The hot filament is protected from air by a glass bulb that is filled with inert gas or evacuated. In a halogen lamp, a chemical process returns metal to the filament, extending its life. The light bulb is supplied with electrical current by feed-through terminals or wires embedded in the glass.

Efficacy: Up to 20 Lm/W
CRI: Excellent
Control Gear: Not required

Tungsten Halogen (Also known as Quartz Halogen)
Halogen lamps are similar to incandescent lamps. A tungsten filament contained within an inert gas together with a small amount of a halogen such as iodine or bromine creates a chemical reaction known as a halogen cycle. This cycle increases the lifetime of the lamp and prevents darkening by redepositing tungsten from the inside of the bulb wall back onto the filament. Halogen typically operate at a higher temperatures than a standard gas filled lamps. The high operating temperature requires a quartz envelope as standard glass would melt.

Efficacy: Up to 30 Lm/W
CRI: Excellent
Control Gear: Transformers are required for low voltage systems.

Fluorescent (Including linear & compact fluorescent)
A fluorescent lamp is a low pressure gas-discharge lamp that uses electricity to vaporise a small dose of mercury which is sealed inside the lamp. The excited mercury atoms produce short-wave ultraviolet light that then causes the phosphor to fluoresce, thus producing visible light.

Efficacy: Up to 100 Lm/W
CRI: Excellent
Control Gear: Required

High Intensity Discharge(HID)
Including Mercury Vapour, Sodium Vapour and Metal Halide light sources. General lighting HID lamps comprise of an inner arc tube and outer hard glass envelope.

Mercury Vapour

Mercury Vapour lamps are becoming less popular due to their low efficiency and high depreciation. Some countries have banned Mercury Vapour lamps.

Efficacy: Up to 50 Lm/W
CRI: Poor
Control Gear: Required

Sodium Vapour

Sodium vapour lamps are very efficient, however they have poor colour rendering properties and therefore are not suitable for applications where the quality of light is important.

Efficacy: Up to 120 Lm/W
CRI: Poor
Control Gear: Required

Metal Halide

Metal Halide lamps have become increasingly popular as they combine both high efficiency with good colour rendering properties. The compact point source of many metal halide lamps has made them ideal for retail lighting applications. Metal Halide is also the primary choice for sporting facilities and other outdoor events where television broadcast and spectators require good colour rendering.

Efficacy: Up to 110 Lm/W
CRI: Good
Control Gear: Required

Light Emitting Diode (LED)
Light Emitting Diodes use direct current (DC) thus requiring circuitry to allow them to operate from AC mains power supplies. Currently only conventional semiconductor LEDs are commercially available, however organic "OLED" and Polymer "PLED" technologies are being developed..

LEDs are rapidly becoming an alternative to traditional light sources. There long life of up to 50,000 hours combined with low power consumption continue to drive them into new applications.

When considering the benefits of LEDs one should also note the following potential issues.

-Glare from bare LEDs can be an issue in some applications
-There low tolerance to heat can cause major problems when trying to use retrofit LED lamps in fittings designed for traditional light sources
-Many LED retrofit lamps have heavy aluminium heat sinks, which can damage lamp holders originally designed for much lighter weight traditional lamps.

Efficacy: Up to 60 Lm/W
CRI: Good
Control Gear: Required

Induction
Induction lamps also known as "electrode less lamps" are light sources where the power required to generate light is transferred from the outside of the lamp envelope by means of an (electro)magnetic fields, in contrast with a typical electrical lamp that uses electrical connections through the lamp envelope to transfer power.

There are three advantages of eliminating electrodes:

-Extended lamp life, because wear and tear of electrodes reduces lamp life.
-The ability to use high efficiency light-generating substances that would react with metal electrodes in normal lamps.
-Improved collection efficiency because the source can be made very small without shortening life - a problem in electrode lamps.

Common Lamp Types | Technilux Lighting

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Technilux Lighting
  • Address Unit 18, 41-49 Norcal Road,
  • Nunawading, Victoria, Australia
  • ABN 69 065 653 885
  • Telephone +61 03-9872-7688
  • Fax +61 03-9874-8299
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