问threejs添加PointLight无效问题？

	const stats = new Stats();
	document.getElementById('test').appendChild(stats.domElement)
	console.log('three', THREE.Scene);
	const scene = new THREE.Scene();

	// box接收6个参数，x,y,z,
	const geometry = new THREE.BoxGeometry(50, 50, 50);

	const material = new THREE.MeshLambertMaterial({ color: 0x00ff00,side : THREE.DoubleSide });
	const mesh = new THREE.Mesh(geometry, material);
	scene.add(mesh)
	
	// 实例化相机，PerspectiveCamera\OrthographicCamera   透视相机加正交相机 
	const camera = new THREE.PerspectiveCamera(50,800/600,1,3500);
	camera.position.set(292, 223, 185); 
	// 相机对着物体
	camera.lookAt(mesh.position);

	// 辅助线
	const axesHelper = new THREE.AxesHelper(100);
	scene.add(axesHelper)
	
	const light = new THREE.PointLight(0xffffff,1.0,4500)
	light.position.set(110,50,0)
	scene.add(light)
	const lightHelp = new THREE.PointLightHelper(light,10)
	scene.add(lightHelp)


	// 渲染器
	
	const renderer = new THREE.WebGLRenderer();
	renderer.setSize(800, 600);
	renderer.render(scene, camera);

	// html插入canvas渲染3d
	let containers = document.getElementById('containers');
	containers.appendChild(renderer.domElement)
	
	// controls 相机控件
	const controls = new OrbitControls(camera, renderer.domElement)
	controls.addEventListener('change',()=>{
		renderer.render(scene, camera);
	})