Of course, having Carradine in your film is always a plus to me.
The idea that people would just freak out because of darkness is just mind boggling but that's the beauty of science fiction... it allows you to explore these kinds of ideas.
Worth checking out if you're a major science fiction fan especially if you lean more towards the intellectual side of the genre.
As for the movie...
DO NOT WASTE YOUR TIME!
There are two versions that I know of based on Isaac Asimov's classic short story about a world bathed in perpetual light where one night in a thousand years, they have complete darkness.
The best I can say is that one movie is not nearly as horrid as the other. One would get a negative rating, the other might be as good as half a star. There is no redeeming value, no great special effects, and to the best of my recollection neither version uses any of the character names from Asimov's story.
Save your time. Save your money. Get a better movie than this.
DO read the original short story by Asimov not the expanded later versions of this timeless classic.