
Being A Proud Hindu, I always had many Questions regarding day to day Rituals followed in our Religion. And One Such Question is Why Do We Light a Diya in our Home Temples ?? And here’s An Answer which I Found from many Elder People:
WHY DO WE LIGHT A DIYA ?

Light symbolizes knowledge, and Darkness, ignorance.
And The Lord is the “Knowledge Principle” (Chaitanya) who is the source, the enlivener and the illuminator of all knowledge.
Hence light is worshiped as the Lord himself.
Knowledge removes ignorance just as light removes darkness. Also knowledge is a lasting inner wealth by which all outer achievement can be accomplished. Hence we light the lamp to bow down to knowledge as the greatest of all forms of wealth.
In almost every Indian home a lamp is lit daily before the altar of the Lord. In some houses it is lit at dawn, in some, twice a day – at dawn and dusk – and in a few it is maintained continuously (Akhanda Deepa). All auspicious functions commence with the lighting of the lamp, which is often maintained right through the occasion.

Well, you might be thinking Why not light a bulb or tubelight?
Well, That too would remove darkness. But the traditional oil lamp has a further spiritual significance. The oil or ghee in the lamp symbolizes our vaasanas or negative tendencies and the wick, the ego. When lit by spiritual knowledge, the vaasanas get slowly exhausted and the ego too finally perishes.
Adding to this, The flame of a lamp always burns upwards. Similarly we should acquire such knowledge as to take us towards higher ideals.
While Lighting the Diya, Normally the followinghymn is prayed:
Meaning:
I prostrate to the dawn/dusk lamp; whose light is the Knowledge Principle (the Supreme Lord), which removes the darkness of ignorance and by which all can be achieved in life.
So This was it. Now you can Proudly Say that you know the Reason behind Lighting the Diya as well as Now you can Light a Diya with More Stronger belief….!! Share it if you think your Friends to need to know the reason for lighting a diya..!
Source……http://fullnfenil7.blogspot.in/
Natarajan