[SOLVED] Glb model is very dark

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Remove your previous light setup and try it with this:

var hemiLight = new THREE.HemisphereLight( 0xffffff, 0x444444 );
hemiLight.position.set( 0, 300, 0 );
scene.add( hemiLight );

var dirLight = new THREE.DirectionalLight( 0xffffff );
dirLight.position.set( 75, 300, -75 );
scene.add( dirLight );

You should only set WebGLRenderer.physicallyCorrectLights to true if you also apply correct units to the lights. For now, don’t set it and see if the above code improves your lighting.

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