Oh, gotcha. Distinction noted. I'll point out that I get best results in Firefly with a blending, using the mesh light to get more accurate distribution, and a point/spot light to get specular and to avoid IDL splotches. I do a lot of test renders with no Poser lights simply to see what the mesh lights are contributing without the confounding variable of also having Poser lights in the scene.

In Superfly, I just use the mesh lights since there isn't a splotch problem, but I could see that using a point/spot may resolve the render more quickly - because of needing fewer samples to get a clean image.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5