A light block is normally used in adventure maps (while most just apply Night Vision or Conduit Power effects). Because to answer your question I'd have to say a bunch of stuff that you probably won't understand. Then doing tutorials on Minecraft modding. This value determines the block's light level. It emits a light level the same as a torch. I also think that glowstone blocks, end rods, redstone lamps and sea lanterns should emit more light than a torch. It is invisible but the hitbox can be seen if you hover over it. Light blocks are not in the player's creative inventory. I suggest this should work like redstone. You have a block (most likely modded) that is returning null for it's material color. But here it is: if you are making your own block you need to extend the block class and either call the setLightValue() method from your constructor or else @Override the getLightValue() method. They can only be obtained using /give, with any data value from 0 to 15. I made a separate suggestion for that. Glowstone dust can be placed on top of any block that redstone dust can be placed on. Like, could I change the tags so that a block of concrete could emit light? Hi, everyone. Usage . I'm wondering if there is a way, with command blocks in creative mode with cheats on, to make a block emit light. Unfortunately this is not properly reported by the map code, so it just crashes a little further down the line, without showing what the block is.