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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/SVGFESpotLightElement/limitingConeAngle below:

SVGFESpotLightElement: limitingConeAngle property - Web APIs

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The limitingConeAngle read-only property of the SVGFESpotLightElement interface reflects the limitingConeAngle attribute of the given <feSpotLight> element.

An SVGAnimatedNumber object.

In this example, we access the angle in degrees between the spot light axis (i.e., the axis between the light source and the point to which it is pointing at) and the spot light cone, by using the limitingConeAngle read-only property of the SVGFESpotLightElement interface.

<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="specularLightingFilter">
      <!-- Apply a specular light effect to the SourceGraphic -->
      <feSpecularLighting
        in="SourceGraphic"
        specularExponent="40"
        lighting-color="lime"
        surfaceScale="5">
        <feSpotLight
          x="100"
          y="100"
          z="50"
          pointsAtX="100"
          pointsAtY="100"
          limitingConeAngle="30"
          specularExponent="40" />
      </feSpecularLighting>
    </filter>
  </defs>

  <!-- A circle to display the effect of the lighting -->
  <circle
    cx="100"
    cy="100"
    r="50"
    fill="lightblue"
    filter="url(#specularLightingFilter)" />
</svg>

// Select the feSpotLight element
const spotLightElement = document.querySelector("feSpotLight");

// Access the limitingConeAngle property
console.log(spotLightElement.limitingConeAngle.baseVal); // Output: 30

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