This determines how focussed the glow effect is. A low eccentricity value will create a concentrated glow with a fast decay. A high eccentricity value will create a ball-like glow.
The degree to which a glow effect will focus towards the center is limited. For very low values( 0.01 ) the quality parameter should be increased for the best effect. Generally, however, it is best to use a glow with a low spread value with a halo effect that is more spread out.