This mod allows vanilla (and also modded, see below) torches to be placed on the ceiling (upside down). The mod supports the normal torch, the soul torch, and the redstone torch. The redstone torch interacts with redstone like any other redstone torch that is attached to the same block would. If you want this mod to work with a different mod's torches, please ask me about it and I'll see what I can do about adding support.
Please take a look at this dedicated mod support page to find out which mods are supported by Ceiling Torch. Original functionality of mod torches is kept as best as possible. Some (but not all) of their ceiling torch variants can be found in the images tab on this page to give you a general idea.
You are allowed to use this mod in any modpack.