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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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LED at 50

Here’s a BBC News Technology story and video that was brought to my attention by Bob Jones at Publitek—Thanks Bob!

LED at 50: An illuminating history by the light’s inventor. Scroll through the images—they’re amazing.

Celebrating 50 years since the advent of LED technology, Nick Holonyak compares his first visible LED invention to GE Lighting's latest 27-watt LED available in 2013, replacing the 100-watt incandescent. (Photo: General Electric)

Source:  http://www.edn.com/electronics-blogs/led-zone/4398696/LED-Week-in-Review-Ikea--Enlightenment-via-Texas-Instruments--Plessey--Wireless-bulbs-shine-on--LED-at-50?cid=Newsletter+-+EDN+on+LEDs