I want to make an irregular shaped light

I want to make light with irregular shape. For now I use sphere geometry and I add sprite

var spriteMaterial2 = new THREE.SpriteMaterial({
        map: new THREE.TextureLoader().load('./IMG/glow.png'),
        color: 0xffffff,
        transparent: true,
        opacity: 0.6,
        blending: THREE.AdditiveBlending

with this map, but i do not like result. Every light has same clear edges

You material setup is correct and should work.

Sprite material should be added to the Sprite instance, which already has proper geometry, as shown in the code example here: