This article is about the Firefly block that gives off light and is found on trees. You may be looking for the Firefly mob that appears as a green, floating orb.


Name Firefly
Source Mod Twilight Forest
ID Names
twilightforest:firefly (MC 1.12)
Type Block
Stackable Yes (64)
Blast Resistance 0.0
Hardness 0.0
Solid No
Transparent Yes
Affected by Gravity No
Emits Light Yes (15)
Flammable No
Required Tool Any tool

The Firefly is a block similar in appearance to the Cicada. However, while they are found in the same place and look similar, they serve two very different functions: the Firefly illuminates light (a light level of 15, the highest possible block or skylight level) whereas the Cicada serves as a noisemaker to the player. The Firefly is found on trees in the Twilight Forest, usually at high elevations, making it a tricky challenge to get to but a possibly rewarding venture as Fireflies give off the maximum possible light level.

The Firefly can be placed in a Glass Bottle to create a Firefly Jar; however, the Firefly Jar only gives off a light level of 8, which hostile mobs can spawn in. Thus, a Firefly Jar does not serve as a method of mob spawn prevention, merely as a method of aesthetic lighting that does not prevent mob spawns. If Fireflies are desired as a method of lighting areas, caves, etc., then they should not be placed in jars and kept in block form to ensure maximum possible lighting potential.


Firefly can be used to create the following items: