in poser we can not make the light wider. or the specular bigger. for example light 2 can not be bigger then light 1. with passes we can do this.

i made the  Blinn eccentricity 0.25. on light 2 i turned off the specular. after the render was finished i changed the Blinn and made it wider. then i rendered out a specular pass.
so now it looks like light 2 is bigger then light 1.