Glow lamp life cycle directly depends on many factors, beginning from quality of connections of all elements and finishing with stability of rated voltage in network. To prevent fast burn-out of bulb in the stairwell, it is necessary to know some nuances.
Have bought new bulb, and it has worked only several days? Why instead of the working hours stated in passport 1000 in practice there is only 30-40? It is possible to sin, of course, to producers, but most often the reason of so small life cycle of bulbs of incandescence is in the elements entering electrical circuit and operating conditions.
Instability of voltage level of network
Perhaps, it is possible to call this reason one of the most often widespread. Gostovsky standards report that tension of single-phase network (220 V) can lie ranging from 198 up to 242 Volts. In principle producers have to manufacture glow lamps which quietly could work energized in 220 V.
However it not always so. If for gostovsky indicators this digit is norm, then for bulb – critical. It is connected with the fact that at the increased tension temperature of tungsten thread can reach 2300 °C. And it, in turn, leads to intensive evaporation of tungsten and to reduction of diameter of tungsten thread. The it becomes thinner, the quicker it will tear. At night day the power supply network of residential building unloads as very few people use electricity at this time, line voltage increases that leads to reduction of life cycle of bulb.
As to fight against it
Upon purchase of bulb get acquainted with indicator of its rated voltage. Buy the bulbs calculated not on 230 V, and on 240-245 V and then they will serve to you much longer. And even if in your house at night tension remains invariable (about 220 V), all the same be guided by this recommendation. Remember that if the operating voltage of bulb will be only 10% less rated, it will allow to increase its term of operation at once several times. As good way out also installation of the power conditioner which will protect not only glow lamps, but also all household household appliances from differences and failures in the power supply network acts. One more way is installation to the place of the switch of svetoregulyator which will allow to regulate the voltage output of network smoothly. Installation of the rectifying diode or the diode bridge acts as very widespread way of life extension of bulbs. Here it is better to use the silicon CD 203A diode which "will force" to burn glow lamps in the mode of non-feet for several years.