By BizLED Bureau
October 10, 2015: According to a study, lighting produced by blue and white LEDs that demonstrated daylight can increase concentration and cognitive performance in students.
Biologically-optimised LED lighting
The study showed that students who studied in the classroom with biologically-optimised LED lighting got better results?their concentration was higher and their performance speed was much more?than the students who have not studied under biologically-optimised LED lights.
What the study investigated
During the study, the students in both the classrooms?with LED lights and with conventional lights?repeatedly took concentration and performance tests. The test results were then compared to see the biologically effective LED light and conventional lights.
The biologically-optimised lighting was created by combining blue and white LEDs. Osram developed such LED luminaires that have biological effects on the students in the classroom.
Osram created an artificial sky inside the classroom by using blue and white LED strips, and each of these strips were controlled separately. This helped to mix the light colours dynamically and reproduce the colour temperature inside the classroom, similar to the original sky.
What are the benefits on the students?
The biologically-optimised LED lights stimulated the body to make a student feel as if she was outdoors. This enabled to shift forward the students’ circadian rhythms so that she is alerted earlier in the day. According to the researchers, this can handle ?social jetlag?, that is, tiredness in the morning that is often observed in students.
The study found that 35% reading speed was increased; 45% frequency of errors was dropped, hence improving concentration; and 76% hyperactivity was reduced due to the calm LED lighting when these students were given mathematical problems to solve.
Another study has shown that LED lighting prevents students with autism from having headaches, nausea and eyestrain, that are usually caused by the flicker of fluorescent lights.
The logic behind the result
The biological photo-receptors of a human being respond to blue light, and the range of maximum sensitivity approximates a wavelength of 460 nanometers. The ganglion cells of the retina get excited by blue light, and with a high colour temperature. Cool white light with a colour temperature of 6,500 Kelvin, or 8,000 Kelvin or higher, are suitable.
The Photo-receptors when distributed uniformly over the retina of the eye, has greatest effect, and this is achieved with planar lighting. As the sensitive receptors are found in the lower portion of the retina, light enters from the above excites the receptors. This gives the effect of the sky. So is effect was achieved in the room with blue and white LEDs.
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