two sided foliage shader effect brightness/intensity

Is there a way to make the light trough leafs effect not as strong/bright? I know I can control the intensity with the opacity in the material, however the darkest seems to be 1 while 0 is super bright and and anything above 1 has no more change on the effect. I still find 1 to be too strong so I hope there is a way

I know I can make this effect more subtle by reducing the sun intensity, however this is not a good solution here - any ideas? thanks

The amount of light going through the leaf can be controlled by SubSurfaceColor, while BaseColor is the light reflecting off the front of the leaf. Opacity just controls shadowing density.

For example if there are some leaf veins which darken the light passing through the leaf, you would put that darkening in SubsurfaceColor.