Most sleep experts (including pediatric sleep experts) recommend blacking out your room, removing all electronics, etc.
Perhaps an expert in this area can chime in, but I don't think light during sleep is positive.
From an evolutionary biology standpoint, I would expect being able to sleep through light and noise a negative for survival.
By comparison, phone and laptop screens start around 400 lux and go up from there.
Many nightlights I've tried are at least 0.5 lux depending on distance, but are often higher (1 lux or more)
Given the wonders of dark adaptation of the human eye (https://en.wikipedia.org/wiki/Adaptation_(eye)#Dark_adaptati...), does that really matter? In my experience, the full moon is almost bright enough to comfortably read normal black on white printed text.
As a rough estimate, one decade (10x) of the eye’s light adaptation, at most, comes from aperture variation - the pupil expanding and contracting. The rest comes from intensity-driven modification of the sensing and image processing systems in the eye - rods that are completely saturated with signal above a few dozen lux become the primary sensors in very low light.
In other words - just because the moon provides enough light to see and even read doesn’t mean that it will cause insomnia.