The suggestion about low lighting in the article, I recently read that reading in low light is associated with myopia/nearsightedness in children so there is that angle too.
My kids are mostly in bed by the time this matters to me, at least in the winter months. And I'd like to think they get plenty of lighting during the day, as we kick them outside for some period of time every day, regardless of weather (bundle up in the winter).
We have a well windowed house (just not in the OS sense), so it's rather bright in there - when the sun is up. And I don' think LEDs matter when the sun is up. I think they do matter after the sun is down, when I'm careful about light.
So if you've got some studies arguing that "bright light indoors, after the sun has gone down, is important to children," please - link them so I can read them.