How much electricity does a headlight really waste?

I am sure that if you have ridden a bike or a scooter in India, this would have happened to you. How man times did it happen that you rode with the headlights turned on during daytime and people on the road end up signaling to you that your headlights are on.
This amuses me to no ends. I mean why would you care about a switched on headlight?
Of all the things that should not be happening on a road and demand a greater interest as a citizen or rather roadizen, why would a humble, feeble bulb bother?

Why not the street lights left on during day, the garbage heaps in the open … I can think of tens of other anomalies on the Indian roads.

And yet I get signaled to turn off my headlight and with such care and concern as if the world’s existence depends upon that headlight being turned off.

Why? :)