HCL in indoor commercial lighting applications rise so that employees can more clearly more spirit

Today, the "human centered lighting", "night lighting" and "bio lighting" and other words often appear in newspapers, in fact, no matter is the word, it said: the appropriate dimming lighting can be in 24 hours for mankind to create ideal conditions.

And no light can like LED "adjustable", can provide the light source according to specific spectral power, color temperature, color and brightness. In short, the lighting in the morning and afternoon can stimulate people's excitement, they can relax at night. It can be transferred to the same level with the sun, so as to strengthen the millions of years of sunrise and sunset rhythm and circadian rhythm of 24 hours.

If the designer can be as much as possible the natural lighting into the LED color palette, it will have a huge impact. As we all know, stimulation and vigilance can improve the learning efficiency and can help relax, sleep. On the contrary, at the wrong time, wrong light could destroy these things, some researchers believe it will help develop cancer, diabetes and other diseases.

Adjustable light, human centered lighting (HCL) can be applied to any places, such as schools, offices, hospitals, family etc..

Human centered lighting (HCL) in the hospital the most effective. Some time in the day LED to stimulate the blue frequency in other time tune into the warm light tone can help patients with sleep and recovery. While in office, a carefully designed lighting system can improve morale and productivity.

The study found: day and night right helps to sleep and plenty of spirit

Rensselaer Polytechnic Institute Lighting Research Center (LRC) director Maria Nafi Gro (Mariana Figueiro) have been considered, in the office, day and night right can help employees to sleep better at night, and can help them.

Rensselaer Polytechnic Institute in the U.S. General Services Administration (GSA) five different buildings were studied for a period of three years, then together with the GSA report said: "the staff of the office in the morning to accept enough effective light or sunlight, better than those in the lower pressure and depression and sleep dim or people under low illumination."

The study of 109 participants, they will be wearing a pendant electronic LRC designed to measure the light intake standard "CS" on LRC, ranging from 0.1 to 0.7. The highest point of 0.7 on behalf of natural daylight.

Figueiro in the morning and found members exposed to CS at least 0.3 employees "to fall asleep faster than CS for the value of 0.15 or less employees, better quality of sleep." The participants in the winter and in the summer of the 7 consecutive days of wearing this electronic pendant. The results showed that CS in 0.3 or more, sleep better in the winter, summer is the same. Decompression advantage is the same.

Only in the preliminary study

Figuero said: "I was not surprised by the results, this is what we expect. This light is very important, there are a lot of night light, night light, such as mobile phone display light, but we are in the indoor time is 80%-90%, the 2/3 time in the office. The people are not aware of the importance of office lighting, it can help you sleep better at night."

Figuero said that the study was "the first stage of her research, there are three stages. It is worth noting that the first stage did not involve dimming. On the contrary, it is only measured participants obtained from existing light source, including natural light and traditional fluorescent lamp, did not even include the LED light source.

In the summer and autumn of 2016, the "second stages in two different places". LRC installed LED panel lights behind the staff directly at the computer screen, about 40 participants.

Figure 1. LRC installed LED source in the study, the light is adjusted to 0.3 CS, in order to improve the degree of excitement. The participants said, think more clearly and more spirit. (photo: LRC lighting research center)

LED adjustable light has great potential but is still the best source of sunlight

LRC scientists are measuring the light effect on nocturnal sleep, stress and depression in the first stage, the scientists also recorded a stimulating effect. The assumption was that when CS is 0.3, the light will stimulate the eyes, causing happiness, this is because when the light shines on the non visual receptor of the retina (ipRGCs), which stimulates called melanopsin pigment.

The second stage is the result: "through the intervention, we found that the subjects self reported no sleep will be more and more energy," "We collected data in the winter, we found that if a CS can provide 0.3 of the light, will increase their subjective feelings, reduce sleepiness, increase energy and vitality."

The third is to further prove LED dimming potential effectiveness of alternating day and night. Figuero believes that the health of the lighting should be based on the "layer" transfer, which can be ambient lighting lamps from the ceiling, and the circadian rhythm of light can be derived from direct exposure to the eyes of the low lux blue frequency. Although direct exposure to the eyes of light sounds like a "Arabian Nights", but Figueiro pointed out that the 30 LX in the low light level, blue light will still improve the degree of excitement, but will not cause annoying glare. She said: "if you do 470 nm, you only need 30 LX, so people think it is very comfortable," "you don't even see so much, because you have the ambient light and blue light has been integrated into the."

Although the LED tunability has great potential, but also very Figueiro