"High light levels" makes it sound like you could just replace 50 watt bulbs with 100 watt bulbs indoors to fix the problem. It's not like that at all. Sunlight is dramatically brighter than indoor lighting, far more than people realize. It would be impractical to replicate sunlight brightness indoors for many reasons: energy consumption, the cost and size of the fixtures, the immense heat it would produce, and generally because it would be uncomfortable to have light sources that bright in close proximity to you.

And again I am skeptical of claims that it is just one factor like brightness alone. There is other research about spectrum and distant objects in view that also shows effects. So even if you did use 100x brighter lights in your house there's no guarantee you would fix the problem.