Practical example 2: Spatial performance for visual notification.

The technologies used to generate light have a considerable effect on the range and perception of visual signals. 3D-Coverage demonstrates the differences.

FLASHING LIGHT PERFORMANCE LENS COLOUR AREA LxWxH 3D-COVERAGE
Competitor's LED 120 cd clear 7 x 7 x 3 m 147 m³
PYRA® M (xenon) 118 cd clear 23 x 18 x 10 m 4140 m³

Beacon technology can influence safety.

The colours mainly used in signaling technology are red, amber, yellow, green and blue, and clear/white. The range of application types includes:

  1. Alarm.
  2. High-priority warning.
  3. Low-priority warning.
  4. Information/Indicate/Status.

Visual signals for “Alarm” and “Warning” must be perceived without fail under all circumstances. Such requirements benefit from signaling devices with the largest possible coverage area.

“Clear” signals were chosen for this example because they are perceived more readily at further distances.

Xenon vs. LED.

Comparison of a Xenon flashing light with an LED flashing light, both with the same current draw, demonstrates the difference the technology makes. Apart from measured signaling distance it is also important to consider the specific light emitting characteristics.

The Xenon light was clearly superior.

The 3D-Coverage values are evidence that the Xenon technology offers a wider range and is more readily perceived.

The reason for this is that the Xenon flashing light emits a very short but intense pulse with a peak value far exceeding 100,000 cd. The light pulse of an LED flashing light is longer, but only reaches around 400 cd.

Furthermore, because the Xenon gas is energised in a glass tube, the light signal is emitted evenly in all directions. Conversely, the linear nature of LED light relies on reflectors and optical lenses to create an omnidirectional profile.