The fluctuating source voltage causes the distributed voltage not to have a nominal value of 220V and affects the characteristics of the lighting. In this study, observations were made on the change in source voltage of the three types of lighting during peak load times. The purpose of this research is to show that any change in the source voltage (PLN) can affect the lifetime of the light bulb. From the results of research on one of the LED lights, when 0 hours is turned on, the source voltage is at 227.0 volts with 108.4 Lux lamp illumination. When 12 hours are turned on, the source voltage is 225.9 Volts with 103.3 Lux lamp illumination. There was a decrease in source voltage of 1.1 Volt and a decrease in illumination of 5.1 Lux. And when 24 hours the lamp is turned on, the source voltage is at 230 Volt with 97.8 Lux lamp illumination. There was an increase in source voltage of 4.1 Volt and a decrease in illumination of 5.5 Lux. As a result of frequent increases in source voltage, the lamp lifetime will decrease more rapidly.