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Light boxes for light therapy usually produce between 2,500 lux and 10,000 lux .
Percentage of light reaching the forest floor was measured with a foot candle / lux meter.
Because lux is lumen-per-square-meter we just needed to factor in the surface area to be able to calculate the total lumen output.
These lighting technologies were concomitant with the dark that humans lived with, due mainly to their low candle-power or lux .
A glazed facade admits sunlight into the space, controlled by a special ‘sandwich’ assembly of perforated metal, colored glass, and microlouvers that limit illuminance to 3.5 lux .
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