Probably the earliest form of artificial light the fire lit for warmth and cooking purposes. The torch must have been originally simply a burning stick taken out of the fire. It was perfected when it was found that it would burn longer and more brightly when dipped in fat or oil. The use of far on the torch may have suggested the rushlight, which consisted simply of a rush steam, or some tow, floating in a vessel of oil or liquid fat. The Indian Chirag is just the same principle. A great improvement on the rush light was the candle; but the still greater improvement was the lamp, burning mineral oil, such as kerosene.
Light made our life brighter:
So far, the principle of all artificial lights was the same: they were all oil lights. But the discovery of coal-gas as an illuminant in the 19th century led to a new form of artificial light, namely gas. For the greater part of the 19th Century, gas was the chief kind of artificial light used in the houses and streets of towns. It gave a far better light than candles and lamps and was much more convenient.