public void setBlurStart(float blurStart) {
        this.blurStart = blurStart;
    }
sets the blur start<br>
at which distance from the light source the effect starts default is 0.02

@param blurStart the desired start distance (in world units,
default=0.02)
jme3-effects/src/main/java/com/jme3/post/filters/LightScatteringFilter.java