update() {

		this.light.updateWorldMatrix( true, false );

		if ( this.color !== undefined ) {

			this.material.color.set( this.color );

		} else {

			this.material.color.copy( this.light.color );

		}

		/*
		const d = this.light.distance;

		if ( d === 0.0 ) {

			this.lightDistance.visible = false;

		} else {

			this.lightDistance.visible = true;
			this.lightDistance.scale.set( d, d, d );

		}
		*/

	}
Updates the helper to match the position of the
light being visualized.