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#lightDot {
display: none;
}
#thisSvg:hover #lightDot {
display: block;
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mix-blend-mode: color-dodge;
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<linearGradient id="gradientBackground">
<stop offset="0" stop-color="#001a2c" />
<stop offset="1" stop-color="#341600" />
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<animate attributeName="y2" values="1;0;1" dur="3s" repeatCount="indefinite" />
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<radialGradient id="gradientLightDot">
<stop offset="0" stop-color="#fff" />
<stop offset="1" stop-color="#000" />
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<radialGradient id="gradientLightCircle">
<stop offset=".87118" stop-color="#000" stop-opacity="0" />
<stop offset=".92628" stop-color="#fff" />
<stop offset=".95108" stop-color="#fff" />
<stop offset=".98001" stop-color="#000" stop-opacity="0" />
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<g>
<rect data-name="背景矩形" fill="url(#gradientBackground)" width="100%" height="100%" />
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<circle id="lightDot" class="is-blend" data-name="光点" fill="url(#gradientLightDot)" r="9.5">
<animate attributeName="r" values="5;30;10;30;5" dur="5s" repeatCount="indefinite" />
<animateMotion dur="5s" repeatCount="indefinite" rotate="auto">
<mpath href="#motionPath" />
</animateMotion>
</circle>
<ellipse class="is-blend" data-name="底部投影" fill="url(#gradientLightDot)" cx="60" cy="110.06757" rx="56" ry="6.52377">
<animate attributeName="ry" values="2;10;2" dur="2s" repeatCount="indefinite" />
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</g>
</svg>
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