How do I earn Light Up the Level in Iron Snout?

Solution 1:

You have to knock a wolf into it. Usually, crouch, then hit left/right up up to knock a wolf in the air, then left/right again to knock them. They have to hit the lamp. It zaps them for about 3-5 seconds, so you have to be quick with it

edit: The lamps don't have to be lit at the same time - just in the same fight.

Source: just unlocked it