It depends on the effect that you want. Star Trek the Next Generation illuminated their ships farely well because they wanted to show a sleek, bright future. Deep Space Nine used very harsh lighting with portions of the station going to black because they wanted to show the "grittyness" of their particular reality.
Your graphics should show something similar. Meowx's Magma ships all go to black because the general tone of their environment is very "gritty" and not all sleek and beautiful. On the other hand, the original EV graphics were very sleek and didn't have many things that marred the surface of their ships. That universe was portrayed in a very different light, despite the fact that the story wasn't changed.
Matrix
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"Nothing is fool-proof to a sufficiently talented fool."