pocketmine\level\Level::setBlockLightAt PHP Method

    public function setBlockLightAt(int $x, int $y, int $z, int $level)
    {
        $this->getChunk($x >> 4, $z >> 4, true)->setBlockLight($x & 0xf, $y & 0x7f, $z & 0xf, $level & 0xf);
    }