@Override
public int getLightValue(IBlockAccess world, int x, int y, int z) {
    Block block = world.getBlock(x, y, z);
    if (block != this) {
        return block.getLightValue(world, x, y, z);
    }

    int meta = world.getBlockMetadata(x, y, z);
    if(meta > 8) {
        return 15;
    } else {
        return 0;
    }
}