filter.svg

<svg width="100%" height="100%" style="padding-top: 200px;">

  <defs>


    <filter id="filterlight">
      <feGaussianBlur id="gauss" stdDeviation="10" in="SourceGraphic" result="BLUR"/>

        <feSpecularLighting id="source" surfaceScale="6" specularConstant="1" specularExponent="30" lighting-color="white" in="BLUR" result="SPECULAR">
          <fePointLight id="light" x="150" y="100" z="200">


          </fePointLight>
        </feSpecularLighting>
        <feComposite operator="in" in="SPECULAR" in2="SourceAlpha" result="COMPOSITE"/>
        <feMerge>
              <feMergeNode in="SourceGraphic" />
              <feMergeNode in="COMPOSITE"/>
            </feMerge>
    </filter>

  </defs>


 <rect id="rectobject" width="300" height="200"  fill="black" filter="url(#filterlight)" />

</svg>