public void setExposurePower(float exposurePower) {
        this.exposurePower = exposurePower;
    }
defines how many times the bloom extracted color will be multiplied by itself. default is 5.0<br>
a high value will reduce rough edges in the bloom and somehow the range of the bloom area

@param exposurePower the desired exponent (default=5)
jme3-effects/src/main/java/com/jme3/post/filters/BloomFilter.java