Long ago, I asked how far Earth would orbit the sun if one year lasts 372 days instead of 365 and how much it'd affect the overall brightness. What I got was that Earth with a 372-day calendar would be orbiting the sun from a distance of 93,930,000 miles, resulting in a two-percent dimness of sunlight. Not noticeable to our eyes, but I suspect that the plants and animals would be more sensitive to that.
In an alternate Earth, there is a moon orbiting the planet, but it is not as large as ours. However, it orbits so closely that, to our eyes, it looks bigger--one-and-a-half degrees wide, three times bigger than our view of the moon. There is another source of light--a series of rings 15 degrees wide, originating from a brown dwarf star that orbits the sun from a distance of 30 AUs.
With these two sources of light, how bright would day and night be on this alternate Earth?