Redstone Lamp

Redstone Lamp

150px

150px

Type	Solid Block
Stackable	Yes (64)
Tool	any
First Appearance	12w07a
Gravity	No
Luminance	Yes, 15 (when on)
Flammable	{{{flammable}}}
Data Value	{{{data}}}

File:Redstone Lamp melt pattern.png

Redstone Lamps being powered and snow melting pattern.

A Redstone Lamp is a brownish (when off, and gold when on) block visually resembling Glowstone (due to its crafting materials) that gives off light as long as it is powered. While powered, they have a luminance of 15, one level higher than a torch and the same light level as glowstone. They require constant input in order to emit light. Similarly to other light emitting blocks, they will melt snow and ice.

Crafting

Name	Ingredients	Input » Output
Redstone Lamp	Redstone, Glowstone

Behavior

A redstone lamp will light if it is powered, or if it is next to a powered (solid) block. Levers can be directly placed onto lamps to power them.

A redstone lamp with a switch placed on it will behave just like a standard solid block, meaning that if a redstone lamp is powered, it will power the block adjacent to it. It will also power redstone wire if it is placed on top of, underneath, or directly next to the lamp following the same principles as a standard solid block. Unlike glowstone, when a redstone Lamp is broken it will not break into glowstone dust nor redstone dust. Instead it will yield one Redstone Lamp, just like a standard block. It should also be noted that the lamps have not yet been optimized so a large number of blinking lights can cause FPS drops or even crashes.

A redstone lamp activates normally, but takes 2 ticks to deactivate.

Uses

Redstone lamps can be used as an attractive and functional light source. Where the lamps are hooked up to a switch, caution should be used when leaving a room with the lamps off, as mobs will likely spawn in the unlit room. This can be used to the player's advantage; in a trap based on a monster spawner, for example, redstone lamps on a switch can be activated to raise the light level and temporarily prevent mobs from spawning. Similarly, lamps could be turned off to allow growing huge mushrooms, then on again to avoid mob spawning.

Redstone lamps can also be used to create a redstone display as an alternative for redstone torches, which do not emit much light, the player creating such a display however should be aware that each "pixel" is a small cross making straight lines impossible. This can be corrected by making the screen 2 blocks (of any redstone conducting block) thick. Then add levers or some other activator on one side of the display. On the opposite side, only one pixel will be displayed.

Alternatively: to make a solid wall of square 2*2 pixels, this arrangement can be used. The redstone wires exit the back every second horizontal and vertical square, meaning that they can be individually controlled.

• Pixel.png

  Wiring up redstone lamps as pixels

A system of redstone lamps wired to a daylight sensor with an inverted signal can be used to illuminate a structure at night automatically. A half day clock can also be used as long as the clock is synchronized properly to spawning light levels of mobs.

Because mobs can spawn on unlit lamps it makes them a great way to make a mob killing system because you can control when you want the mobs to spawn by having the lights on or off. You can also hook up a bunch of lamps to a line of repeaters to make a timed light.

Redstone lamps may also be used for automated mushroom farming, since a mushroom will "pop" if the light level becomes too high.

Video

Redstone Lamp/video

History

Lanterns

Before Redstone lamps, Notch wanted to implement an item called the Lantern, but the idea was scrapped and only later reemerged as the Redstone Lamp; however, several differences exist between the two.

With the addition of the lantern, torches would flicker out and need to be re-lit with flint and steel. The lantern would serve as a permanent source of light. According to Notch, when the update would occur, all torches placed on the map, in the inventory, and in chests prior to the update would be converted to lanterns. To do this, the lanterns would use the (former) block ID of torches along with a re-skin.

The glowstone introduced in the Halloween Update was a potential item requirement to craft lanterns, as it has the greatest luminance as a raw material. This would also make lanterns relatively inaccessible and a risky item to get, as has been hinted at by Notch. A second potential item that might have been required to create lanterns was Netherrack, a block that never burns out while lit. Glowstone can be obtained by trading with villagers, and can also be obtained by going to the The nether, along with netherrack.

Trivia

• In Notch's Ludum Dare 22 contest entry, Minicraft, lanterns can be made in the crafting table.<ref>https://s3.amazonaws.com/ld48/ld22/index.html - Minicraft game made by Notch for Ludum Dare 22.</ref>
• If you set the redstone lamp on a timer so it turns on and off and you shoot an arrow at the top or side, the arrow will vibrate while making the sound of the arrow sticking to a block.
• Although it makes the sound of glass (like glowstone and glass pane) when broken, it acts like a solid block.
• Placing a redstone torch anywhere adjacent to the lamp, other than on the lamp itself, will power it.
• Pressure plates, buttons, and levers can all be placed on top of it or next to it, giving it power.
• Unlike redstone torches, rapidly turning lamps on and off will not burn them out.
• Just like TNT, you can have a block above a redstone lamp, and a pressure plate on that, and the lamp will light if the plate is stepped on. This can be an effective warning method.
• Placing one unlit redstone lamp anywhere beside a lit redstone lamp will cause the unlit redstone lamp to become lit. (This only happens because the redstone lamp transmits power to the second one.)

• This happens only if the lit redstone lamp is powered by a torch underneath it, redstone wire next to it, a button on its side, or a lever on its side. Torches, pressure plates and levers next to a redstone lamp do not light up adjacent lamps. This is the behavior of most opaque blocks as described under Basic Mechanics of Redstone Circuits.

• Redstone lamps can be powered by detector rails, making them an interesting material to use for rollercoasters and lighthouses.
• Placing an on-state redstone lamp will cause it to deactivate due to the lack of redstone powering the lamp.

Gallery

• Redstone Lamp Day (Switched Off).png

  A redstone lamp shown during the day that is switched off.

• Redstone Lamp Day (Switched On).png

  A redstone lamp shown during the day that is switched on.

• Redstone Lamp Evening (Switched Off).png

  A redstone lamp shown during the evening that is switched off.

• Redstone Lamp Evening (Switched On).png

  A redstone lamp shown during the evening that is switched on.

• Redstone-lamp-and-wire.png

  Demonstrating how wire powers redstone lamps.

• Redstone-lamp-and-repeaters.png

  Demonstrating how repeaters power redstone lamps.

• Redstone-lamp-powered-block.png

  Demonstrating how a solid block powers redstone lamps.

Note that lamps are themselves solid blocks, and so power other lamps. This causes the cross-shaped patterns that you see.

• Redstone-lamp-torch-floor-no-block-above.png

  Floor torch with no lamp above it.

• Redstone-lamp-torch-floor-with-block-above.png

  Floor torch with a lamp above it.

• Redstone-lamp-torch-wall-no-block-above.png

  Wall torch with no lamp above it.

• Redstone-lamp-torch-wall-with-block-above.png

  Wall torch with a lamp above it.

A glowing roof is easy to do - just lay wire across the blocks, or line the top of the lamps with redstone blocks. Floors and walls are also do-able. For a floor, just use the "knight's move" shape underneath the floor with torches. For a wall, use wall-mounted torches that power blocks above them.

• Redstone-lamp-floor.png

  A redstone lamp floor.

• Redstone-lamp-wall.png

  A redstone lamp wall.