>
> I am wondering if this problem is solved? I am using double_illuminate scene and
> found that the reflectance of the scene is underestimated (version 3.7.1).
> Thanks in advance.
>
>

double_illuminate is not physically acurate.
Instead, I recomend using the new, as of version 3.7.0, back side 
illumination. It's activated by adding a second value for diffuse as follow:
diffuse 0.5, 0.4

In this case, 50% of the incomming light is diffused from the front side 
and 40% is diffused through the surface to the back side. Front and back 
been relative to where the light is comming from.

Back side illumination is fully compatible with radiosity.
It allow precise controll over the transmitted part of the incident light.
Care should be made to ensure that the sum of the two components add to 
less than one if you want to get physically acurate, or at least 
plausible, results.

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