Which of the following statements is correct regarding the efficacy and use of incandescent lamps compared to fluorescent, HID, and LED sources? select all that applies   a. Incandescent lamps are generally considered superior to fluorescent, HID, and LED sources in terms of color rendering and color preference. b. Incandescent lamps are typically more energy-efficient than fluorescent, HID, and LED sources. c. Incandescent lamps require about five times as much electrical power as fluorescent, HID, or LED sources to produce the same level of illumination. d. Incandescent lamps are often chosen for applications where energy efficiency is the primary concern. e. Incandescent lamps are generally preferred for their high efficacy of 80 to 120 lumens per watt.

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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.