Description
Redstone Lamp is crafted from one glowstone block surrounded by four redstone dust in a plus-shape on the crafting grid. The combination produces a switchable light source: when the block receives a redstone signal, it lights up at level fifteen — the maximum value in the game, identical to a torch or fully-charged glowstone — and goes dark the instant the signal cuts out.
This behaviour makes it the go-to choice for programmable lighting. Wire it to a daylight sensor for automatic dusk activation, to a pressure plate for entry hall lights, or to an observer-and-piston combo for animated displays. Multiple lamps can be controlled in parallel from a single switch, and because the off state is a fully solid neutral block, builds can hide entire ceilings of lamps that vanish flush with surrounding stone or wood when the circuit is off.