A work lamp stands in the house, switched at dusk or during the night. On, it throws a warm pool of light over the rooms (the franchise's picture of safety against the cold night), and long shots land far more often.
The light is seen from far off: while it's on, zekes never get bored and wander away, and more are drawn in from the dark. With ammo to spend it pays; short on ammo, it's a mistake. The pair above is the same moment with the lamp off and on.