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How to choose a warning light ?

Warning lights suitable for use in Hazardous Areas must be designed for potentially explosive atmospheres and harsh environmental conditions, where a high degree of corrosion resistance is required.

Types of lamps :

Incandescent lamps:
A tungsten wire, subjected to high temperatures emits light energy on a broad spectrum.

Halogen lamps:
Using a glass body (smaller volume than conventional bulbs) by filling it with halogens (iodine, bromine). The deterioration of the filament is slower resulting in consistent performance even higher.

Xenon glow tubes:
By applying a high enough voltage in a glass body filled with xenon, this results in a very intense light pulse.

The LED (Light Emitting Diode) are semiconductors that convert an optical voltage in visible light.