Memorandum on Acquisition _ Installation of Light Emitting Diode
LED (Light-Emitting-Diode) is a kind of energy into visible light to the semiconductor, it changes the energy-saving lamps and incandescent tungsten light emitting three basic principles of dye, while the use of electric light. According to the analysis, LED is very obvious characteristics, long life, high luminous efficiency, no radiation and low power consumption. LED spectrum is almost all concentrated in the visible light spectrum, the luminous efficiency of more than 150lm / W (2010 years). The LED and incandescent, spiral energy saving lamps and T5 fluorescent trichromatic comparison, results showed that: ordinary incandescent light efficiency 12lm / W, life expectancy is less than 2000 hours, spiral energy saving lamp light efficiency 60lm / W, life less than 8000 hours, T5 fluorescent lamps compared to 96lm / W, life is about 10,000 hours, while the diameter of 5 mm white LED light effect can be more than 150lm / W, life can be greater than 100,000 hours. It was also predicted that the future of LED lifetime limit will be infinity.
Federal Aviation Administration Memorandum Date: SEP 1 72010 To: All Regional Airports Division Managers tP/�_, From: Ri�arinelli, Manager, Airport Engineering Division, AAS-l 00 Prepared by: Alvin Logan, Airport Engineering Division, AAS-l 00 Subject: Acquisition & Installation of Light Emitting Diode (LED) Runway Centerline and Touchdown Zone Lighting Systems The purpose of this memorandum is to announce a moratorium on the acquisition and installation of FAA LED Runway Centerline (L-850A) and LED Touchdown Zone (L-850B) Lighting Fixtures built in accordance with Engineering Brief 67, "Light Sources Other Than Incandescent and Xenon for Airport and Obstruction Lighting Fixtures" and listed in Appendix 1 of FAA AC 150/5345-53C Addendum, "Airport Lighting Equipment Certification Program". Flight testing of the subject lighting systems has recently been conducted at Raleigh-Durham International Airport during nighttime VFR. The consensus reached was the lighting intensity of the LED fixtures exhibited bright signals even at the lowest step setting (step 1 of 5) of the constant current regulator. The Airport Engineering Division is currently coordinating with industry to address this issue. We anticipate subsequent modifications to the Engineering Brief in the near future. Once the issue is resolved, we will notify the Regions of the product updates. Please contact Alvin Logan at (202) 267-8743 with any questions.