NICHIA Ultra-High CRI: Optisolis™ LED: closest possible match to natural light

NICHIA Ultra-High CRI: Optisolis™ LED emitters’ natural light closely matches spectral profile of sunlight.

Nichia Optisolis LEDs with the full spectrum of sunlight

The latest innovation in LED development is the Optisolis technology form world market leader Nichia. Optisolis™ LED emitters provide a natural light source with a spectrum which achieves the industry’s closest match to that of the standard illuminants, sunlight and incandescent artificial light, having a CRI higher than 98.

The Optisolis family of LEDs are Ultra-High CRI light sources, as they have maximum scores for all 16 of the color samples that are used in the color rendering index metric. The 5000K Nichia NF2L757G-F1 Optisolis LED can even achieve a Ra of 99 out of 100. Similarly, the scores with the new IES TM-30-15 light quality tests are equally high, with Rf at 98 and Rg at 99. 


Nichia Optisolis 5000K test

As the above test shows, the Nichia Optisolis has the highest light quality on the market at the time of this article.

This extraordinary result is achieved by using a revolutionary new phosphor technology in combination with a special blue LED chip. The spectrum of the blue chip is 420nm, contains almost no UV emissions and combined with the phosphor technology make possible the above-mentioned CRI values. The lack of violet or ultraviolet (UV) spectral energy in the emission and reduced blue light peak are very important aspects in many lighting applications such as  Human Centric Lighting, Museum and Art Gallery Lighting or Horticulture.

Human Centric Lighting is a special type of lighting that adapts to the human inner clock and thus to the biorhythm. The Optisolis natural light spectrum fits perfectly because of the Ultra high CRI. The lack of UV light and reduced blue peak will ensure overall health and sleep patterns are only positively influenced. 

For museum and art gallery lighting, the Optisolis LEDs with the almost maximum CRI and TM-30-15 light quality scores will deliver the most faithful reproduction of colors and the best understating of the artist's message. The lack UV light will safeguard precious works of art from light related damage. 

Additional applications include Horticulture, with the daylight spectrum leading to optimal plant growth in greenhouses or enclosed spaces, color evaluation (e.g. painting, printing), commercial lighting (e.g. retail, etc.) or other applications where Ultra-High CRI is desired.


Human Centric lighting

Human-centric lighting’ describes lighting that is designed to work with the human body’s natural rhythms. It relies on the well-established fact that the human eye detects the presence of a particular wavelength of blue light in the spectrum that makes up sunlight, and uses this to judge what time of day it is. In this way, light helps regulate our sleep–wake cycles and other bodily rhythms, and has a significant impact on our mood and well-being.
Color temperature of sunlight
Human-centric lighting harnesses this effect by adjusting its brightness and colour temperature during the day to mimic natural light. To achieve its purpose, human-centric lighting must have a spectrum that resembles that of real sunlight, with just the right level of the crucial blue wavelength that triggers the body’s response. Most solutions described as human-centric do not have a spectrum that resembles that of real sunlight, so they end up providing too much or too little blue. 

Nichia Optisolis LEDs are different, as are their light is closely matched to real sunlight, so they have the right level of blue that trigger the desired biological stimulus.


Commercial lighting revealing true color of merchandise

Nichia Optisolis light fixtures merchandise will look as under natural light, with the same color and contrast. The high quality light spectrum is expressed by both the traditional color rendering index (CRI) and the new Color Fidelity Index. Tests confirm, with CRI at 97+ and TM30 Fidelity Index at 96, values that indicate the high accuracy of reproducing the original color from 99 representative color indexes.


Light to reveal true color and depth for works of art

The Nichia Optislos LEDs uniform spectral power distribution enabled by a three-phosphor mix render art naturally, ensuring that visitors will fully experience color and texture. Paintings, frescoes, mosaics, sculptures and many other exhibits will have a lifelike appearance with more realistic color tones relative to any prior lighting. Moreover, the light from Optislos LEDs result in a high contrast ratio that means viewers can better perceive depth — and therefore the texture — in the works of art. 

The first to implement Nichia Optisolis lighting are museums in Germany: Zeppelin Museum in Friedrichshafen, the Ludwig Museum in Koblenz and the Picasso Museum in Münster.

Optisolis LEDs reveal true color of art

The difference between the previous lighting system, with CRI80 LEDs (LEFT) and the new Nichia Optisolis CRI98+ (RIGHT) is clearly visible in the case of the paintings housed in the Zeppelin Museum Friedrichshafen.

Manufacturers should choose Optisolis™ where they want to deliver a lighting product with a spectrum where all colors are reproduced as seen under a standard light. (Figure 1). As such, they will offer a solution with a color rendering index that has been significantly improved compared with the current products for general lighting. (Figure 2) Most importantly, since UV emission is essentially non-existent in the spectrum, the degradation of irradiated materials will be reduced dramatically compared to that of other light sources containing UV emission, including other market available LEDs.

The Optisolis family consists of two series, the NF2W757G-F1 and NF2L757G-F1. Both series are housed in a 3 x 3 x 0.65 mm package.


  • CRI: up to 99
  • Typical luminous flux:
    - NF2W757G-F1: 23.0lm at 65mA
    - NF2L757G-F1: 24.1lm at 65mA
  • Max. forward voltage: 3.3 V
  • Radiation angle: 120 °
  • +120°C maximum junction temperature

Applications of the Optisolis full-spectrum LED

  • Museums and art galleries
  • Hospitals
  • Retail lighting
  • Commercial Lighting

We recommend: LinearZ Modules with Nichia Optisolis 5000K


Easy to build full spectrum, natural light LED fixtures thanks to our Optisolis LED strips

With our LinearZ Nichia Optisolis LED strips you can easily build linear lighting fixtures thanks to the plug & play connection and Zhaga format.