specularExponent attribute controls the focus for the light source, a larger value indicate a more "shiny" light.
<feSpecularLighting> the value should be in the range 1.0 to 128.0
If the attribute is not specified, then the effect is as if a value of 1 were specified.
|Normative document||SVG 1.1 (2nd Edition) : feSpotLight
SVG 1.1 (2nd Edition) : feSpecularLighting
The following elements can use the