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Today in the world light is the source energy in the world. Many improvements have been done in the sector of light either to make it more or to give an appearance that is appealing to the eye. If you think of starting a new apartment that is meant for any activity, the first thing you should think of is the system of lighting and how you would design it. Different scientists have come with different lighting systems that are designed to perform different tasks or serve at different places. Light is obtained from different sources.

characteristic spectrum

The main source of light on Earth is the Sun. Sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides generally all the energy used by living things and all the energy that is present in the atmosphere. Historically, another important source of light that humans have used for a long period since their evolution began is fire, from ancient campfires to modern kerosene lamps. With the development of electrical light sources and power systems, electricity lighting has effectively replaced firelight. Some species of animals generate their own light, a process called bio luminescence. For example, fireflies use light to locate mates and also for their effective locomotion at night.

There are many sources of light. A body at a given temperature that is slightly high emits a characteristic spectrum of black-body radiation that produces light. A simple thermal source is sunlight, the radiation emitted by the chromosphere of the Sun at around 6,000 kelvins that is capable of serving the whole world without it depleting for lifetime, peaks in the visible region of the electromagnetic spectrum when plotted in wavelength units and roughly, 44% of sunlight energy that reaches the ground is visible. Another example is incandescent light bulbs, which emit only around 10% of their energy as visible light and the remainder as infrared and is therefore transformed to heat and lost to the atmosphere. A common thermal light source in history is the glowing solid particles in flames, but these also emit most of their radiation in the infrared, and only a fraction in the visible spectrum.