The light almost begun with the discovery of fire, the earliest form of artificial lighting used to illuminate an area. Campfires and torches are used with fire to obtain light. It is believed that as early as 400,000 BCE, fire was kindled in the caves of Peking Man. Prehistoric people used primitive lamps to illuminate surroundings. These lamps were generally made from natural materials such as rocks, shells, horns and stones which were filled with grease and had a fiber wick. Lamps in human history typically used animal or vegetable fats as fuel. Hundreds of these lamps (hollow worked stones) have been found in the Lascaux caves in modern day France, dating to about 15,000 years ago. Most of the Oily animals (birds and fish) were used as lamps after being threaded with a wick. Fireflies have been used as lighting sources. Candles and glass and pottery lamps were also invented. Chandeliers were an early form of "light fixture".
Major reductions in the cost of lighting occurred with the discovery of high amounts of whale oil and kerosene. Gas lighting was economical enough to power street lights in major cities starting in the early 1800s, and was also used in some commercial buildings and in the homes of wealthy people. The gas mantle boosted the luminosity of utility lighting and of kerosene lanterns. The next major drop in price came about with the incandescent light bulb powered by electricity.
Over time, electric lighting became ubiquitous in developed countries. Segmented sleep patterns disappeared, improved nighttime lighting made people made more activities possible at night, and more street lights reduced urban crime. The drop in price is continued by flourescent lights which give a certain luminousity with homogenious spread of light waves.
Today, the last drop in price about lighting is the invention of LED (Light Emitting Diode) which is far more cheaper in Lumen per watt comparison. LED, with its color options, lumen options, power options and compatibility to decoration and devices, is one of the miracles of our century. SOLi, is the ultimate outcome and example of LED lighting. This solar powered outdoor light, integrated with an efficient lithium-ion battery bank, is the unique way of lighting without any cables, canals, workmanship etc. SOLI is the plug and play utmost point that lighting history have reached so far.