I wanted to make a block that melts like ice. I use the tick method in the BlockEntity to periodically check the light level. However 

level.getBrightness(LightLayer.BLOCK,pos);

always returns 0.

show more code

public class GreenIceBlockEntity extends BlockEntity {
    public GreenIceBlockEntity(BlockPos pos, BlockState state) {
        super(ModBlockEntitys.GREENICE.get(), pos, state);
    }
    public void tick(Level level, BlockPos pos, BlockState state, GreenIceBlockEntity blockEntity){
        int l = level.getBrightness(LightLayer.BLOCK,pos);
        System.out.println(l);

    }
}

 

I have this problem. I create BlockPos with Y position plus 1 (it is air on my block), but i have always 0 return

level.getRawBrightness(blockPos, 0)

This gives you the max of the block light and the sky light.

It's what gets used by vanilla for things like mob spawning or crop growth.

Replace blockPos with blockPos.above() if your block does not let light through it.