It sounds too common, check if it is already available in the market or not. Later try to Google the appropriate site for patents in India. Search the FAQs over there, you will get all your answers over there.

It will cost several thousand dollars US and take ~ 1.5 years.

You don't need to get the patent before producing it just do a patent disclosure to protect it and start making it.

Use Phillips electronic ballast and tubes. It has been there for decades and is still the best in the industry,

Learn to use capital letters, punctuation and write. I doubt you have anything worth patenting or can afford it.

i had made a circuit to light a particular type of tube light.. and a man is gona help me in term of money to start the production.. so , before that i want my ciruit to get patent in my name.. how much time it will take and money? i am from India..