Tagged with 'Tunable white'

Human Centric Lighting with ajustable intensity and color temperature

Human Centric Lighting with ajustable intensity and color temperature

Human Centric Lighting (HCL) is an illumination specially designed to have a positive physiological and/or psychological effect on humans. It consists of adjusting the colour and intensity of the light throughout the day using adjustable white LED lighting solutions.

HCL supports human health, well-being and performance by considering and properly planning the implementation of a lighting system according to the desired visual, emotional and above all biological effects of light. Human Centric Lighting focuses on the needs of people for their living, leisure and working environment. The study is based on the properties and effects of natural light, a dynamic source of changing tone and brightness that changes throughout the day and seasons. 

 

A combination of white LED light sources, usually warm white (2700K) and cold white (6500K), is used to provide adequate human-centred lighting. This solution is also called Tunable White lighting. By adjusting the intensity of each individual, bright or dull white light with a hue between 2700K and 6500K can be achieved. It is a new way of using and implementing artificial light, corresponding to the changes of natural light and research on the effects on humans.

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LED modules with tunable white technology for Human Centric Lighting.

With our range of tunable white LED modules and strips you can easily and accurately reproduce the color shade of natural sunlight.

Tunable white light is the key ingredient of Human Centric Lighting (HCL). This type of lighting aims at harmonizing lighting with our specific needs and positively influence fundamental psychological processes such as concentration, productivity, mood, sleep-wake cycles and more

Scientifically, this shade is called color temperature and is measured degrees Kelvin (K). Thus, at sunrise and sunset on a clear day the color temperature of natural light is 2000-3500K, what we call warm white. In the morning sunlight is of pure white, color temperature of 3500-4500K, and at noon cold white 5500-6500K.

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Nichia LEDs color temperature bins & sorting intervals

Nichia LEDs color temperature bins & sorting intervals

White light has different shades  and while there is no general consensus, warm white light for LEDs has a value of 2500K-4000K on the color temperature scale, pure white 4000K-5000K and cold white 5000K-10.000K.

Warm white LEDs, as with all manufactured products, have material and process variations that yield products with corresponding variation in the shade of white light emitted.  For example Nichia warm white LEDs just out of the production line can have a color temperature between 2580K and 4260K.  If they would be directly integrated into strips or luminaries they will yield color inconsistent products that are generally unusable. 

 To overcome this problem, LEDs must be color sorted by the manufacturer with additional further sorting down the supply chain, if necessary. 

Color sorted LEDs are grouped in batches known as "Chromaticity Bins". Nichia, as a LED manufacturer, groups white LEDs in many Bins, thus allowing very good control of the white light color of your project.

The Nichia Bins for new generation LEDs start with the letters "sm" follower by a series of numbers, where the frist two describe the color temperature (65 as in 6500K) while the last two narrow down the selection interval.

Nichia also offers color sorting in 3step, 5step and 7step MacAdam ellipses. While a detailed explanation of LED color sorting can be found here, we recommend that you choose the color sorting based on your project:

  • General Lighting: 3step
  • Ambient Lighting: 3step or 5step, where 5step could be more affordable
  • Street and Christmas lighting: 7step
  • Flashlights:  5step or 7step

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