Healthy light spectrum


Full-spectrum LED:
healthy light that is easy on the eyes

XPECTRUM – XAL's new daylight-like full-spectrum LEDs deliver healthy, biologically effective light. The natural daylight spectrum is achieved by reducing the blue light component and increasing the cyan values. This minimises blue light's risk to the eye and sets it at a level similar to daylight. The resulting non-visual, the so-called melanopic light effect, affects numerous bodily functions and is thus partly responsible for better sleep, increased concentration, and well-being. The excellent colour rendering of CRI 98, R 1-15 and IES TM 30 Rf = 98 and Rg = 101 helps improve visual comfort as well. This daylight-like colour spectrum is now available for your next biologically effective lighting design for almost all XAL products.

Image: Full-spectrum LED 4000K

Image: Commercially available LED 4000K

Minimised blue light hazard

The pupil size adjusts according to the natural incidence of light. Studies by GAMLIN already showed in 2007 that the eye's natural pupillary control is in the cyan range. Standard LEDs, on the other hand, have a very high blue content and few cyan wavelengths. As a result, the eye's sensitive cells adjust to darkness under these light conditions. As a result, the pupil dilates and excessive blue light reaches the retina. The importance of protecting the eye from excess blue light is described in the EN 62471 standard (photobiological safety). XAL's XPECTRUM LED reduces the amount of incident blue light to a daylight-like level, reducing the strain on the retina.

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Melanopic light effect

Light sets our inner clock. Lighting that follows the course of natural daylight supports the human biorhythm. The effect goes beyond the visual field. The non-visual or biological effect of light influences numerous bodily functions, such as hormone release, and is partly responsible for well-being and health. The evaluation of this melanopic lighting effect is described in DIN SPEC 5031-100 and can be realised with the new XPECTRUM LEDs.

More performance - better sleep

XAL's full-spectrum LEDs have a high proportion of cyan wavelengths. This suppresses the hormone melatonin faster and more completely. A sharp drop in melatonin levels in the morning favours the rise of cortisol. This in turn lets us reach our performance capacity faster and to stay focused longer. The right balance of melatonin and cortisol boosts alertness, stimulation, and productivity during the day and deep sleep and regeneration at night.

Highest colour rendering

Strong colours have an activating and emotional effect on people. The XPECTRUM LEDs boast excellent colour rendering. The colour fidelity rating of the test colour saturated red is > 95; the Ra – the average of the first eight test colours – and the Re – the average of all 15 test colours – is 98, indicating excellent colour fidelity.


In addition, the IES TM 30-15 colour rendering evaluation from an average of 99 test colours results in a colour fidelity of Rf = 98 and a colour gamut of Rg = 101, an excellent result.


Thanks to XAL's full-spectrum LEDs' high colour fidelity, it is easier for the eye to detect and authentically perceive objects in artificial light.


High melanopic effect factor – very efficient in biologically effective light planning

Increased well-being and better sleep

Improved ability to concentrate

Minimised risk from blue light, as the pupil size adapts to the natural incidence of light

Visual comfort thanks to high colour fidelity – improved contrast when reading

We're here to help

Almost all XAL's products can use full-spectrum LEDs with the highest colour fidelity upon request. Would you like your project to meet the requirements of standard-compliant melanopic lighting effects? We are happy to support you with biologically effective lighting design. Get in touch for an individual consultation appointment.

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