Energy Simulation, taking into account albedo of urban context

Hi everybody,

I am running energy simulations with Honeybee/energyPlus.I would like to be able to account for the influence of the urban context on one building's heating/cooling loads.

The solar masks aspects are ok. I have a brep for the urban context that I input in the "Honeybee EP Context Surfaces" component.

But I don't find the way to input albedo/reflectance values for the urban context. I have tried to input a RADMaterial in the "Honeybee EP Context Surfaces" component. But my simulation results do not change when I change the reflectance of the RADMaterial.

Many thanks in advance for your help!