The wiced_bt_mesh_light_lightness_nvram_id_start saves the configuration and states for the model. It is used for the low layer stack which is in the lib file and is not open to the customer.
I want to know which configuration and states are saved and the detail locations in the nv !
The information for the model state are defined in the model spec: https://www.bluetooth.com/specifications/mesh-specifications/
The NVRAM information are defined in the lower level of the SDK and not open to the customer. May I know why you need these information?