Light Source

A lightsource is any object that provides light in the game world. Examples are torches, candles, water candles, chandeliers, chain lanterns, and certain tools/weapons such as the Enchanted boomerang. The Orb of Light produces a sphere of light that follows the player around.

There are other light sources that aren't inventory based such as lava, shadow orbs, demon altars, and some plants.

Some kind of permanent light source is required for a house to become and NPC Home.

The most notable and most powerful light source is, of course, the sun.