Sure, i mean something like this should control the backfacing, or make an emission shader cast light only in one direction:
But it does not work in rhino cycles, maybe because i am using the blend component, as there is no shader mix component ?
btw. the color of the transparent component is set to black, if i turn it to white, if still does not show the red of the emission component, but i can see that the backface is colored differently....but no red.
...edit, ok, it seems that the default strength for the emission is set to zero, if i change this to 1, the red color shows up. Is this the correct way to make backfacing materials, in this case make an emission cast only into one direction ?
it does not seem to work using the groundplane feature though, so i added a plane below the half cylindric shape.