Page 7 - ingenioren

BASICS OF LIGHT

Xenon Strobe Rotating
Brilliant flashes of light, which can be enhanced An electric motor drives a parabolic reflector
through a freznel lens. The tube life is typically 5 around the light source on a vertical axis to create
to 8 million flashes after which light output are a powerful beam of light travelling through 360°.
reduced by approx. 70%. These units are available with either a filament or
halogen bulb.
These units are the most efficient available
incorporating light output with the brightest and In general this type of beacons has a greater
most effective visual signal. degree of light output than other models, but this is
redused as the parabolic reflector only iluminates
LED on given point at a time. The downside on this units
Unlike the filament bulb and the Xenon tube, LEDs are their very limited lifetime.
emit only one frequency of light.(i.e. one colour) and
cannot yet manage the brightness of a Xenon tube. FIilament & Halogen Bulb
However, they only require a relatively low current Usually operated with an additional circuit, to give
and have a very long lifetime, giving an effective a steady output or more effective blinking output.
solution where an indication or statur is required.
The light output can be improved by the use of
a freznel lens. The main advantage of this type
of beacon is that the light can be controlled by a
separate source control panel, giving the unit more
flexibility.

Determining the selection of light
* Safe atmosphere or potentially explosive atmosphere
* The ambient level of existing light
* The light output required from the beacon
* The duration the beacon has to operate
* The IP rating of the beacon
* The electrical supply available

Colour Purpose How much the lens colour effect
the intensity of a light source.

1: Red Danger, act now 85%
2: Amber Warning, proceed with care 49%
3: Yellow Telephone text 14%
4: Green Go ahead 85%

5: Blue Specified Notice/Warning 88%
6: Clear No specific meaning 0%
7: White No specific meaning 0%
8: Purple Radiation 85%