From time to time I have to put my very energetic cat in my bedroom for an hour or so while I'm cleaning, or working on something I can't have her messing with. In the evenings if the lights are off, it's very dark in the bedroom. Do you think my cat cares whether the light is on or off?
Cats are crepuscular, which means they prefer to be awake at dawn and dusk. As such they've evolved to prefer neither complete darkness or bright light.
That said, human sight is also suppose to be best at dawn and dusk as well. However, cats proportionally have more rods than cones in their eyes than we do. (Rods are what give us are ability to see in very low light and their placement in our eyes is why we can see better out of our peripheral vision in very low light.) Thus cats likely prefer a lower light levels than we do, and are able to see better in darker environments.