Hello,

The cost of lighting of a room depends on the following.

1. The layout- whether you want to lay pipes in walls, slabs including fixing fan box, switches sheets etc.
2. How many tube lights, bulbs or fancy lights, power plugs and fan etc to be fixed in the room.
3. The connection- whether the connection in the room is to be taken from electrical pole including cost of electrical wire etc.

If you want to calculate the actual cost, provide more details according to the points made in the answer.

Thanks