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Traffic Signal Lamps Duro-Test is committed to providing you with the highest quality of traffic lamps. Super V-Beam and Watt-Saver Traffic Krypton Lamps
Duro-Test V-Beam and Watt-Saver Traffic Krypton signal lamps are constructed for 6,000 to 16,000 hours of rated life which allows them to operate reliably for at least 9-24 months. At Duro-Test, we know that after safety, lamp cycling and maintenance costs associated with bulb replacements are the greatest concern. Industry reports prove that traffic lamps are not the main factor associated with the high cost of traffic lighting. The main costs prove that traffic lamps are not the main factor associated with the high cost of traffic lighting. The main costs are a result of spot lamp replacements, which include time, labor, and various resources. Duro-Test traffic lamps experience minimal lamp burnouts and are designed to allow you to schedule group relamping. Overall labor costs are the lowest when lamps are group-replaced at scheduled maintenance intervals. Group replacing all lamps routinely is economical when a comparison is made between the direct cost of the new lamp and the cost of sending a crew with a truck and ladder between scheduled maintenance dates to replace a single burned-out lamp. The number of individual lamp replacement trips is reduced when Duro-Test high-reliability, long life, traffic lamps are used. In addition, the unique V-Beam filament construction of Duro-Test traffic signal lamps achieves approximately 10% greater candlepower in standard traffic signals than ordinary lamps with a circular filament arrangement (C-9 shape). Traffic safety requirements make it mandatory to keep signal lamp outages as rare as technically possible and to replace failed lamps immediately. Designed specifically for long life, durable construction, and high beam brightness, Duro-Test traffic signal lamps meet these safety requirements. Duro-Test lamps are manufactured under strict quality standards to eliminate defects, which lead to early burnouts. It is generally recognized by Traffic Department administrators that the most economic method of signal system operation consists of using specifically constructed signal lamps of superior quality, which reduce failures between scheduled maintenance periods. The cost of maintaining traffic signal systems in good working order depends upon the allowable length of scheduled maintenance intervals. The reliability of reasonably up-to-date signal equipment results in group replacement intervals that can be spaced 9-12 months. Under more favorable systems conditions, maintenance intervals may be even longer. Duro-Test traffic lamps are of uniform quality with a long-life rating so that practically all lamps burn through the full group replacement interval and only a small percentage fail between these intervals. Long
life rating for Super V-Beam and Why is it necessary that lamps for economic traffic signal operation have long life ratings when, during group replacement intervals of 9-24 months, the lamps are scheduled to operate for only 3,300 hours on average? the answer is related to the average percent of lamp failures in the life in incandescent lamps. In order to keep lamp failures at 2-5% of all lamps installed during the 9-24 month interval, the average user-hour rating must be 6,000 - 16,000 hours. However; the actual percent of lamp failures may vary depending upon the conditions existing at the signal. Vibration from surface traffic, buses, cars, trucks, and severe weather conditions will increase the number of early failures within the group replacement interval. Quality Features of Duro-Test Traffic signal Lamps
ITE (Institute of
Transportation Engineers) Super V-Beam Because a high degree of shock and vibration resistance is required with traffic signal lamps, the construction of the filament produces relatively low luminous efficacy results. Also, the long life rating, which is required in order to achieve a small number of early lamp failures, also reduces luminous efficacy. The Duro-Test V-Beam filament design increases the candlepower so that luminous intensity requirements can be met with less lamp wattage. "V-Beam" filaments are similar to those used in projection lamps and are characterized by the design shown in figure 4 (C-IIV) compared to that of a signal lamp of similar wattage with a conventional circular filament (C-9) arrangement (right). Figure 4 For economical signal operation, this low percentage of early lamp failures is obtainable as illustrated by Figures 1 & 2. These figures present the statistical life performance of high quality incandescent lamps and refer to a sizable number of 6,000 and 16,000 hour life-rated signal lamps. The figures show the percentage of lamps still intact are dependent upon operating hours. During the first 2,000 operating hours, the number of lamp failures is very small. At 3,300 hour hours the burnout rate is approximately 3% hour lamps and 4-5 % for 6,000 hour lamps. Beyond the 3,300 hours, the number of burnouts increases faster until half of the lamps have burned out and the remaining half are still operable. For comparison, Figure 3 illustrates the life statistics of another sizable number of incandescent lamps, also of good quality, but designed for only 3,000 hours rated life. The contour of the curve indicating the increasing number of lamp failures over life is the same as in Figure 1 for the 16,000 hour rated lamps and Figure 2 for 6,000 hour rated lamps. However, the time when the failure rate reaches 3% is as early as 1,100 hours, equivalent to only about 3-4 months of traffic signal operating time. Therefore, using lamps with such short average life rating requires group replacement of all lams at 3-4 month intervals. This 3-4 month operating time is uneconomical. The curves of Figure 1, 2, and 3 are clear illustrations that lamp design is a definite requirement for achieving savings by reducing maintenance costs in traffic signal installations. It is important, however, to stress that the lamp life statistics as shown in Figures 1 & 2 are only realistic for high quality lamps manufactured uniformly with the greatest care. Otherwise, early failure rates may be much higher than indicated by the curves. A long life rating alone is not sufficient for obtaining a low rate of early burnouts; numerous other quality features built into the lamp during manufacture must accompany it. Both the Super V-Beam and Watt-Saver Traffic Krypton signal lamps have five filament supports for resistance to shock and vibration. In the V-Beam lamp, the center support is bent away from the circle toward the lamp axis; thus, the central part of the filament forms a "V". The bottom point of the "V" extends toward the lead wires beyond the lamp axis with an essential part of the filament length closest to the lamp axis. As a result, the filament is close to the optical axis of the signal, which increases candlepower. The filament of the Duro-Test lamp is relatively short in order to protect the lamp base and signal socket from excessive temperature and to protect additional light in an axial direction. Depending upon wattage,, Duro-Test V-Beam signal lamps produce 10-25% higher candlepower efficacy in standard signal heads than conventional signal lamps with the circular filament construction.
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