This was not a gimmick by Modi. This was an exercise to raise the spirits and to motivate the citizens. You must have noticed how refreshed and happy you felt while looking at all those candles and lamps around you.
It's like a war song every battalion has for its soldiers. 1/2

Neither of them had any scientific reason behind it per se. It was all done for the pscylogical disadvantage one might be in due to shutdown and everything.

This wont be the end of this either. We will have another one of these next week too. So buckle up and stay at home. 2/2