This mod adds light bulbs into Minecraft! Light bulbs are toggle-able sources of light (their light level is 15, 1 higher than a regular torch), which can only be placed on the underside of overhanging blocks. Light bulbs can be either wired directly, or have redstone wires running on the overhanging block above them. When light bulbs are smashed they drop one glass shard. Four glass shards are needed to reconstruct a regular block of glass.