Aviation Obstruction Light
High-rise structures and buildings such as
towers, chimneys and smoke stacks are potential hazards to aircraft. As such
mandatory provisions are in force for providing AOL's for hazard indication on
structures above 6 m in height.
Types of lights:
LED Lamps :
These lights are most suitable for aviation lights, even if they are costly. These lights provide longer life and very low power consumption, (5 to 15 W for low intensity, 25 W for medium intensity), they are very reliable due to multiple circuits, improved power factor, shock-proof,LED Display and are able to stand with voltage fluctuations of ±25 %. They eliminate possibility of non-compliance from aviation authorities due to failed lamp.
GLS Lamps:
lightsThese lamps usually
consume 100W. And they have an average burning life of 1000 hours and a MSCP
(mean spherical candle power) of 100 cd. They emit white light and red
wavelength is only one seventh of total color spectrum, effective MSCP is only
about 12 cd. Also they are very sensitive to voltage fluctuation and also susceptible
to over voltages during the night in upcountry. They have a fragile filament
that can break early due to high wind velocity. Also, the soft glass dome lens
provided in these AOL's gets extremely hot and tends to crack in rain. There is
a rubber gasket of these AOL's also tends to get damaged due to heat, allowing
water ingress. Even all things being good, they have a very short life span
considering 12 hours usage, the bulb needs to be replaced every three months.
To ensure fail safe operation, two lamps are used. For medium intensity AOL's,
double light fitting is only used and used 500 to 650 W lamps.
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