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Xenon flashtube

 

Xenon flashtube

By applying a sufficiently high voltage in a bulb filled with the noble gas xenon, a very intense light pulse or flash of light is generated as a result of sudden discharge. Xenon beacons are still used in any situation that requires the brightest of light signals. No other type of beacon can compete with the absolute luminous intensity of a xenon beacon.

ADVANTAGES

  • Good signalling effect thanks to intense light pulse

DISADVANTAGES

  • Inside of flashtube turns black over time and light output is reduced
  • Service life reduced by high current density and electrodes being charged as a result or by degeneration of energy store
  • Service life reduced by vibrations and impact

Incandescent bulbs

Incandescent bulbs

A filament of tungsten wire is heated to a high temperature, which causes it to emit energy across a wide wavelength range, including in the visible range. Incandescent bulbs are now mainly used when low maintenance is an important factor and when the initial outlay is more of a concern than energy consumption.

ADVANTAGES

  • Most simple and cost-effective light source
  • Available in a wide range of shapes, voltages and outputs

DISADVANTAGES

  • Low light output: 8-18 lm/W
  • Limited service life: approx. 1,000 h for standard bulbs
  • Service life reduced significantly
  • by vibrations, impact, flashing operation, etc.
  • Blackening of bulb over time
  • 'Yellowish' light
  • Relatively high loss of light energy when coloured lenses penetrated
  • Lots of maintenance required as bulb has to be replaced on a regular basis

Halogen bulb

Halogen bulb

Halogen bulbs follow the same basic technology as incandescent bulbs. The difference is that energy is emitted as a result of halogens being heated to a high temperature rather than a tungsten wire.

ADVANTAGES

  • Higher light output than incandescent bulbs: up to 25 lm/W
  • Longer service life (about double that of incandescent bulbs)
  • Little blackening of bulb - same luminous flux throughout the entire service life

DISADVANTAGES

  • Limited service life: approx. 1,500-3,000 h
  • Service life reduced by vibrations, impact, etc.
  • Service life reduced by flashing operation (current spike caused by switching)
  • Relatively high loss of light energy when coloured lenses penetrated