OBSTRUCTION LIGHT SYSTEM.

The report describes the design, development and fabrication of a prototype high intensity obstruction lighting system. A detailed light source study was made which indicated a newly developed lamp consisting of a quartz-iodide lamp sealed in a parabolic envelope, was the most advantageous type light source. The lamp was operated at less than rated current so that the life was extended to 10,000 hours on the specified operating cycle. In order to obtain the dimming required, the lamps were connected in a series and film disc cutouts were installed so that the burn out of one lamp would not stop current flow in the other lamps. A current regulator was used to maintain the current thru the remaining lamps constant even after some lamp burn outs. The methods utilized in rotation and synchronization are discussed. A stepping motor is used for rotating and a light activated switch arrangement is used for syncronization. The test procedures and test report are included in the report. It is concluded that the light system meets the contract requirements and it is recommended that the F.A.A. accept the light system Author