Well I wouldn't know for sure unless I looked at the shader more. You can select the shader in the hypershade and export it. Up load it here. But from what I seen on the velvet on my computer, it looks like you might have the ramp pluged in to something other than the Incandescence of the Lamber or Anistrophic.. what ever your useing there.. Like the color channel maybe ?

There is some nice SSS efect that can be gotten from linking the sampler to the lights and this. Ever read Stahlbergs little tutorial on the fake SSS shader ? More just wandering, as there is one little thing he leaves out, LOL.