<svg width="480px" height="600px" xmlns="http://www.w3.org/2000/svg">
<defs>
    <filter id="filter" filterUnits="objectBoundingBox" x="0" y="0" width="100%" height="100%">
    	<feFlood x="0" y="0" width="300" height="300" flood-color="rgb(0, 128, 0)" result="flood1" color-interpolation-filters="sRGB"/>
     <feSpecularLighting result="specOut" lighting-color="rgb(0, 128, 0)" color-interpolation-filters="sRGB">
      <fePointLight x="150" y="150" z="2000000"/>
    </feSpecularLighting>
        
    </filter> 
</defs>
<rect x="0" y="0" width="400" height="400" filter="url(#filter)"/>
</svg>