Also, the generation of electrical harmonics is largely avoided. A high power factor allows efficient use of energy, while a low power factor indicates poor utilization of electrical power. Incandescent lamp, any of various devices that produce light by heating a suitable material to a high temperature. When any solid or gas is heated, commonly by combustion or resistance to an electric current, it gives off light of a colour (spectral balance) characteristic of the material. How to Determine the Number of Fluorescent Tubelight and CFL Lamps in a Final Sub Circuit?. A non-saturating inductor is connected in series with the filament of an incandescent lamp and the increase in resistance of the filament with respect to the increase in temperature is utilized to dynamically modulate the power factor of the circuit during a warm-up interval immediately following lamp … How to Determine the Number of Incandescent Lamps in a Final Sub Circuit? Factoring in the effect of Power Factor, the current drawn from the mains supply will be 0.092 Amps for the high power factor fixture, and 0.16 Amps for the low power factor fixture. With the Each equipment or load has its own power factor and depends on the resistive or inductive load, some typical or common values for buildings, appliances and motors are shown below. The following formula can be used to find the number of light and bulbs in the final sub circuit. Power quality measurements such as power factor, voltage and current total harmonic distortion (THD) are done and reported in this paper. The number of fluorescent lamps, tube lights and compact fluorescent light (CFL) is not equal to the number of incandescent lamp having the same power rating. Lets consider two 20 watt LED flood lights; one with a Power Factor of 0.55, and the other with a Power Factor of 0.95. All that can change, however, when using a dimmer. The power factor for LED lamps are 0.14 where as for CFL it is 0.54 and for incandescent 1.00 as it is a resistive load. Incandescent lamps are purely resistive loads, i.e., they have a power factor of unity, and there are no reactive currents. If the current rating of a final sub circuit is decided before and proper cable and wire size has been installed according to the rating and we want to determine that how many light points should be there at final sub-circuit. Different scenarios are considered with full and partial replacement of incandescent lamps.