Originally Posted by tostao_wayne
because normally the leaf color with back light is almost the same that the color of the same leaf with front light, not totally true, specie by especie and case by case, but for example it's true for a maple.
If you consider a transparency about 0.25, a white transparency color, a translucency value of 1 and the same map use for the color, maped into the translucency color slot, the translucency intensity will be about 0.25 of the total intensity in the other side, and i want almost the same intensity, for that reason i use a multiply node.
For some species i use a reflection map, but desaturated and connected to the reflectivity value, then i tune the reflection color with a plane color.
but that's not necessary if you are already using a 4 time brighter version of your diffuse textures.