Artificial light sources are man-made devices that produce light, allowing us to see in the dark. Common examples include light bulbs, LEDs, and neon signs. These sources are essential for everyday activities, from reading at night to illuminating streets and buildings. The invention of artificial light has transformed our lives, extending the day beyond sunset. Before electric lights, people relied on candles and oil lamps for illumination. Today, advancements in technology have led to energy-efficient options, like compact fluorescent lamps (CFLs) and light-emitting diodes (LEDs), which help reduce electricity consumption and lower bills.