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Day Lighting Productivity Studies PDF Print E-mail
Written by Steve Heising   
May 02, 2006 at 11:51 AM
A number of studies have been conducted that show productivity improvements related to Day lighting as in Sky lights and windows. Similar effects were noted in a Canadian study with simulated Daylight. improvements in student test scores, increases in retail sales, increased office worker productivity have all been demonstrated to correlate posively with daylight.

Daylight is free, except that windows cost more than walls. Unless you select a good window like Alpen heat mirror, there are heating and cooling load issues. Unless you get a good design and incorporate daylight harvesting and lighting controls, you may have glare issues. And finally, unfortunately, windows don't work well underground, in hallways, in stairwells, in basements in interior offices and in elevators. They don't work as well on cloudy rainy days, and they don't work at all at night. Simulated Daylight and Daylighting therefore need to work together to produce the desired benefits. See the Design lights Consortium and other links herein.
Last Updated ( May 18, 2006 at 10:09 AM )
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Lighting News: Green Ballast Daylight Harvesting 
January 11, 2013 by Energy Manager Today Staff



Bronson Sporting Goods has installed Green Ballast‘s patented daylight harvesting fluorescent light ballasts in its new Memphis location. The new ballasts are direct replacements for the existing “standard ballasts.” Each ballast includes a photocell sensor that interacts with daylight harvesting technology, allowing each Green Ballast equipped fixture to:

  • Actively measure the amount of daylight in its coverage area
  • Harvest this daylight and calculate how much fluorescent light is actually needed to provide adequate lighting
  • Adjust the power consumption of the lighting fixture accordingly
Lighting Roundup: Green Ballast Daylight Harvesting
December 13, 2012Energy Manager Today Staff



The Broadway Square Building, a twelve-story office building in downtown Kansas City has installed Green Ballast‘s patented daylight harvesting fluorescent light ballasts, replacing the existing standard ballasts.  The new ballasts adjust power consumption for each lighting fixture, while measuring and harvesting available daylight to calculate and provide only the amount of needed electricity for proper lighting. It is a “plug and play” solution and has controls within each ballast. Green Ballast expects lighting consumption costs in the Broadway Square building to be reduced by over 50 percent.