Glowstick

The glowstick is a form of usable light in Terraria. Although glowsticks do not cast as much light as torches, it has other unique characteristics that make it a viable utility even in the late game. In recent patches, torches no longer cast light when held in water. So, in order to produce light underwater without the aid of an Orb of Light or a Shine Potion, the glowstick was introduced.

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When holding the glowstick in your hand, the glowstick will shine similar to a torch. When left-clicking while highlighting the glowstick, the player will throw the glowstick and it will roll, similarly to dynamite, emitting a low level of light. Unlike torches, when the glowstick is thrown using the left-click, it can be picked back up after 5 minutes. It also should be noted, however, unlike the torch, when a player presses the throw item button the entire stack is dropped, but can be picked back up. Also, if the Glowstick is to be thrown into lava, it will not be destroyed. Glowsticks are also a Material for Sticky Glowsticks

Glowsticks are dropped by Jellyfish, found in Pots, in chests, and is sold by the Merchant at night for 20 copper coins.