Torch

Torch is the most basic light source. You can place it onto the blocks or background walls. See also: list of other lights.

Unlike in vanilla Starbound, torches are one-handed in FU (you can hold a Torch in one hand and Mining Laser in another).

Troubleshooting
Crafting a Torch doesn't require Research (it is unlocked by default). If it's missing from your Crafting menu, then you have one of these incompatible mods: (see list).