I've been wondering for a while now if our indoor lighting is too dim. Even in the shade during midday you're looking at 20,000 lux. Overcast days look dark and dreary and they're on the 1000-2000 lux range.

Meanwhile home lighting is well below the 500 lux range, if not even in the 100-200.

I even suspect that the current near-sightedness epidemic is caused by people spending too much time in dim lighting. Maybe if our indoor lighting was brighter our eyesight would not adapt to become near-sighted as much.