THE EFFECT OF FLASHING ON THE LIFE OF MARINE SIGNAL LAMPS.
COAST GUARD BALTIMORE MD FIELD TESTING AND DEVELOPMENT CENTER
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Comparative life tests were conducted to determine if flashing operation adversely affected the lamplife of marine signal lamps. The results indicated that flashing with sequences having ON periods of 0.4 second or less decreased lamplife by more than 50, compared with identical lamps burned steadily. Lamps flashed on a sequence of one 0.4-second flash every 4.0 seconds provided an average life very near the rated life for marine signal lamps, however, while steadily-burned lamps provided far in excess of rated life. Although not conclusive, the test results indicated that the decreased lamplife with flashing operation is a fatigue effect. Author