3 ms·
Children need to spend around three hours per day under light levels of at least 10,000 lux to be protected against myopia. This is about the level experienced
by eveningcoffee 11y ago
Children need to spend around three hours per day under light levels of at least 10,000 lux to be protected against myopia. This is about the level experienced by someone under a shady tree, wearing sunglasses, on a bright summer day. (An overcast day can provide less than 10,000 lux and a well-lit office or classroom is usually no more than 500 lux.)
Here were I live, we do not get almost any direct sunlight from October till March - sun is just too low and it is cloudy most of the time.
Another problem is the light levels in the offices that are not optimized for the good sight but for the least allowed energy consumption.
- keithpeter 11y agoYup, I'm at 52.5 degrees North and it is pretty grey most of the (short) day in this season. That is balanced by 16+ hours of daylight in June/July of course. One wonders how seasonal variation during the developmental years of a child factors into this.
- XorNot 11y agoPeople tend to chronically underlight indoor rooms anyway, but ignore it because of the light hue. When you switch to CFLs, an interesting experiment is to replace it with a light with the half the wattage of your current one (not an "equivalent to something" wattage). In most cases this means you give yourself about 100-200W of incandescant equivalent output, and in every case I've had someone do it they've been amazed at how much brighter the room is (and been happy about that).
- stefanix 11y agoCan we just skip the CFLs and go straight to LED.