LED-based AVIATION
OBSTRUCTION LIGHT Binay's LED (Light Emitting Diode) Aviation Light is a "fit-and-forget" solution that utilises the latest InP LED technology to eliminate the cost, hazard, and aggravation of frequent replacement - normally an inherent feature of the conventional filament bulb or neon spiral units used in this application High-rise buildings and structures such as chimneys and smokestacks are potential hazards to aircraft. As such, man-datory provisions are in force for providing Aviation Obstruc-tion Lights (AOLs) for hazard indication on structures above 6 metres in height. The International Civil Aviation Organisation (ICAO) specifies a minimum light intensity of 10 candela (cd) in red for Low In-tensity AOLs, which are to be provided on structures of 6 metres to 45 metres in height. For structures ranging in height from 45 metres to 275 metres, it is mandatory to pro-vide Medium Intensity AOLs having a minimum light intensity of 1600 cd. Above 275 metres, a white light AOL of much higher intensity is obligatory. (ICAO Standards Annexure 14, Paragraph 6.3.13.) The usual source of light is a 100 watt filament bulb, having an average life of 1000 hours, and a mean spherical candle power (MSCP, which measures light energy output) of 100 candela. As these filament bulbs emit white light, and since the red waveband forms only about one-seventh of the total colour spectrum, the final light output in such lights is actually only about 15 MSCP. Furthermore, due to the limited life, the bulb has to be changed every three months. At extreme heights (such as in industrial chimneys) this is a hazardous and complicated procedure, involving considerable expense in either the use of outside contractors or additional insur-ance and special allowances if employees are utilised for the job. While neon discharge tubes have been used in these lights in an effort to improve illumination and increase life, these suffer from the disadvantage that the costly high voltage transformers used in these lights require replacement due to frequent failure. Moreover, the quality of neon spirals available in India is extremely poor and they have a high failure rate (which does not conform to even the specified life of 5000 hours). Finally, the higher wattage (VA) and low power factor of the transformer also leads to increased operating costs. Both the filament and neon types described above conform to the ICAO specification for Low Intensity obstruction lights. As with our other products, the BINAY omnidirectional LED-based Aviation Obstruction Light has been evolved in keep-ing with our organisational philosophy of perfecting an LED Furthermore, the LED AOL eliminates the possibility of prosecution from the Civil Aviation Board for non-compliance due to a failed warning light. InP LED Technology: These LED AOLs are constructed of special industrial grade LEDs utilising the latest InP LED technology (which is specified for outdoor LED applications). InP technology LEDs replacement for every incandescent light source. This is an original development - a world-wide first from the inven-tors of the Integral LED Module - and utilises patented BI-NAY technology. Multiple ultra-high luminosity LEDs are used in the unit, which offers the following advantages: |
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Furthermore, the LED AOL eliminates the possibility of prosecution from the Civil Aviation Board for non-compliance due to a failed warning light. InP LED Technology: These LED AOLs are constructed of special industrial grade LEDs utilising the latest InP LED technology (which is specified for outdoor LED applications). InP technology LEDs can not only withstand high humidity and high temperature conditions but are also protected from Ultraviolet-A and Ultraviolet-B solar radiation, which can cause the epoxy encapsulation of the LED to deteriorate. Rugged Heavy Duty Construction: The body of the AOL is similar to the GEC type light, and is constructed in special LM-6 alloy cast-metal. It is sealed against dust and water in-gress (conforming to IP 65). The glass dome is made of toughened clear borosilicate hard glass, which can easily withstand dusty and abrasive environmental conditions (plastics such as polycarbonate are not used, since they are liable to degrade over time due to abrasion in a dusty and windy environment.) Fail-Safe Design: The LEDs in the unit are mounted on a flexible curved printed circuit board to provide omnidirectional light output. They are configured in five series-parallel circuits, and as such each unit is backed up by four standby units. Thus, fail-safe redundancy is built in; even if one circuit fails, the other four circuits will still provide a visible indication. Reliability of operation: All AOLs undergo a burn-in "ageing" period of 100 hours or seven days at 25% over voltage (i.e., 300 volts for a 220V AC light). The ability to withstand these stringent test conditions is ensured by the proper design of circuitry, as well as by the correct selection of InP technology LEDs used. These LED AOLs are available in both single and double-lamp units. The latter type is particularly applicable for haz-ardous and difficult-to-access situations, where changing is difficult. |
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