For most people, a light is a light is a light. But if you take time to think about how lighting affects your day-to-day life, you might be surprised at the impact of natural and artificial lighting on our world.
The creation of artificial lighting dates back approximately 70,000 years to when early humans lit fire to hollowed-out rocks, shells and other natural materials stuffed with moss or similar substances that had been soaked in animal fat.
Today, lighting is much more complex, coming from many different sources and technologies, including halogen, fluorescence, high-intensity discharge (HID) and, most recently, light-emitting diodes (LED). Lights are ubiquitous in our society, with purposes ranging from general illumination to safety to specialty lighting for commercial impact.