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[unsolved][1.7.2]How can i make a block that only emits light at night


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I still have a lot to learn so i am sure there is an easier way but with what i know now this is how i would do it.


create two identical blocks one that emits light and one that dosn't.


in the randomDisplayTick() use world.getWorldTime();


in the block that dosnt emmit light

if it is night use world.setBlock("light emitting version")


in the block that dose emit light

if it is day use world.setBlock("non light emitting version")


This should work but im sure there is a better way out there


Note to get the "actual time" use


double days = world.getWorldTime() / 24000;
int time = (int)(world.getWorldTime() - days * 24000);

I am the author of Draconic Evolution

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This example may work on 1.7.2, but I know it works on 1.6.2.  If you do not know how to use tile entities, please see the tutorial on the wiki. Now, on your updateEntity method, you should have something similar to:


public void updateEntity() {
   boolean isDay = this.worldObj.isDaytime();

   if (isDay && this.worldObj.getBlockId(this.posX, this.posY, this.posZ) == ModBlocks.litBlock.blockId) {
      this.worldObj.setBlock(this.posX, this.posY, this.posZ, ModBlocks.darkBlock.blockId);
   } else {
      if (!isDay && this.worldObj.getBlockId(this.posX, this.posY, this.posZ) == ModBlocks.darkBlock.blockId) {
         this.worldObj.setBlock(this.posX, this.posY, this.posZ, ModBlocks.litBlock.blockId);


This is a start, but there may be some unwanted happenings once the block changes, because Minecraft probably won't like the block changing, but not the tile entity. I also didn't include the server-client syncing code (to sync with the server).

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  • 6 months later...



and safely cast the block access to World.


Then you can try using


to return a different light value.

If that doesn't work, try


- it has a value between 0 and 23,999 in ticks.



I'll help if I can. Apologies if I do something obviously stupid. :D


If you don't know basic Java yet, go and follow these tutorials.

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You might gain some useful ideas (in addition to the ones above) by looking how BlockRedstoneLight works.  There are two instances of it;





It switches between them based on whether it is getting redstone power or not.

If you look at BlockDaylightDetector, it shows you how you might tell whether it's daylight or not.



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There's actually no reason to switch block IDs, you can do it with metadata.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.


Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.


DO NOT PM ME WITH PROBLEMS. No help will be given.

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