A technical thesis investigates performance and behavior of a 15-watt tungsten electric lamp, presenting test methods, measurement apparatus, and empirical characteristic curves that relate candle power to voltage, current, resistance, and wattage. It reports life tests comparing constant-voltage, vibration-free conditions with severe mechanical shock, analyzes mean spherical candle power using Kennelley’s graphical method, and examines the overshooting phenomenon with proposed theories, quantitative measurements, and curve plots. Experimental limitations and sample-size caveats are acknowledged, and final conclusions synthesize the lamp’s efficiency, distribution patterns, and anomalous behaviors observed during testing.