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I wouldn't describe in details if it is a light novel and has to be read easily. But I think that if the whole novel is set there then you will have the opportunity to be quite thorough. Just don't...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/24398 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I wouldn't describe in details if it is a light novel and has to be read easily. But I think that if the whole novel is set there then you will have the opportunity to be quite thorough. Just don't do it at once. Start with some basic facts and tell only what is needed and then as the story goes you can tell more. I think action is very important to make the story light so I'd include a lot of action scenes which use the specifics of that place - I mean you could use the different physics there, the different architecture, the different demographics etc. to make the action scenes more intriguing and also introduce the world to the reader. And to repeat Thomas - make sure that every information you give serves a purpose for the story. To sum up - what I am trying to say - make up of alternative ways to show the environment like action scenes and dialogue instead of just describing.