A world-first study by Queensland University of Technology's (QUT) Sleep in Early Childhood Research Group has revealed pre-schoolers exposed to more light earlier in day tend to weigh more.

When you’re having trouble sleeping, light is the last thing you assume you need.

At the New York Blue Light Symposium press conference, the Blue Light Society will bring together renowned ophthalmologists, sleep specialists and researchers from the U.S. and abroad to discuss the latest studies on the effects of natural blue light and blue light emitted from LED devices on the human body.  

Blue light is important for the body to regulate the circadian rhythm, but too much exposure can cause permanent damage to the eyes, reported Pocono Record.

The one-light-for-all principle is outdated at a time when we are all living and working longer. Today 30-50% of people in work are over 45 years old1 and Royal Philips, the global leader in lighting, says office lighting needs a serious rethink at a policy level. In Europe, the minimum lighting requirements for writing, typing, reading and data-processing in offices is 500 lux2, but Philips has gathered research to show that this is not considered sufficient3 by almost a third of today’s global workforce.

Latest research from Netherlands Health Council indicate there are certain health risks associated to blue lights emitted by LEDs, and further investigations are required, reported NL Times.

CIRCADIAN®, the global leader in managing 24/7 workforce productivity, health and safety in businesses that operate around the clock, announced today that it has acquired a controlling stake in ZircLight Inc. with a $2.5 million Series A investment led by ams AG, a leading designer and manufacturer of sensor and analog solutions including sensor-integrated intelligent managers that are enabling the next generation of smart lighting systems.

It was 1958, when J. Woodland Hasting and Beatrice M. Sweeney wrote the paper entitled "A persistent diurnal rhythm of luminescence in gonyaulax polydra".  Paper concluded on how lights of different wavelength have the ability to change flow of a hormone named melatonin and hence affecting human body clock, also known as circadian rhythm (as shown in Fig 1).The most powerful wavelength to do so was found to be that of blue.

Recent reports by mainstream Chinese media CCTV that LEDs without diffusers causing blindness within 10 seconds has generated much talk in China, but a report by U.S. Department of Energy (DOE) claim LEDs are not particularly harmful compared to other conventional light sources when it comes to nonvisual applications.