Yes. Trying to fix myopia by getting children exposed to more sunlight is a bit of a "let them eat single-source organic asparagus" response: it makes would-be social reformers feel good, but it's not a realistic way to reliably give all children the (apparently) minimum three daily hours of 10,000 lux. Getting all children outside for three hours every day is not realistically possible, and wouldn't be pleasant or even desirable for all of them: bad weather, unsafe neighbourhoods, air pollution. In areas with often-overcast conditions and/or short winter[ days](EDIT) it wouldn't even be sufficient. Classrooms that admit more natural light would be great, but they're not a realistic means of getting to 3h × 10,000 lux across the board, if only because replacing almost the entire stock of primary-school classrooms would be a slow and expensive process. The most obvious solution is to rig up classrooms with multiple SAD lights, light-meter them to ensure that every desk gets at least 10,000 lux when the system is on, then run the system for maybe four hours every classroom day.
(Speaking of which, if I was in charge of a minor child I'd go ahead and stick a SAD lamp in its bedroom and leave it on for most of the day.)
(Speaking of which, if I was in charge of a minor child I'd go ahead and stick a SAD lamp in its bedroom and leave it on for most of the day.)