'Amavsaya ' is a very dark night. This night is Celebrated as Diwali day.In Hindu culture the meaning of light is knowledge , happiness, peace, prosperity.and darkness is a like evil or opposite meaning of light.
The people of Ayodhya lit diyas on the path of lord Rama, so that the lord Rama follow right path. The light of Diyas show a right way so that our soul always follow right path and never turn on wrong path. Light teaches them or give them love ,peace and encourages the people to do right work.
Diwali day Lord Rama kill Ravana and on other side Lord Krishna killed Narakasura . both stories show the victory of good over evil. Decorate your home by diyas and candles. On Diwali day people use candles of different colour, shape & size.
In old times only a stand shape candle are available in the Market but Now-a-days every types like, flower shape, circle shape, star shape candle are available in the market. However electric lamps, light bulb are available in great demand in the market. Enjoy coming Diwali with new idea, happiness and new hope.