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Working of the human eye

The relationship between light and visibility is more complex than one might think. Color temperature and the interaction between light wavelengths affect our vision, our alertness and our sense of well-being. Consequently, Innolumis dedicates a lot of research into which light wavelengths work best for the human eye.

Our eyes have two vision systems: one for daytime and one for the dark. These light-sensitive cells (rods and cones) work best at other separate wavelengths. By choosing LEDs that stimulate exactly these wavelengths, our eyes see more efficiently, and both vision systems can reinforce each other. We call this 'mesopic vision'. 

S/P ratio

The S/P ratio is a characteristic of a spectrum and is defined as the ratio between night vision (scotopic) and daytime vision (photopic). Public lighting with a high S/P ratio enable us to see much better when the light intensity is low, it also requires less energy to obtain the same level of visibility. More visibility with less energy.


Three mesopic light colors

The mesopic light sources in Innolumis luminaries are built up by red, green and blue LEDs. With this RGB concept, an optimal light spectrum is developed so that excellent vision is obtained with little energy. At the relatively low light levels provided by public lighting of up to 10 lux (about 0.6 cd/m2), our eyes are primarily sensitive to green and blue light. This can be noticed, for instance, from the fact that people can still see by the bluish shine of the moon. For this reason, Innolumis lights contain relatively much green and blue which improves visibility in the night. Red is added for improved color recognition. In this way we have developed three light colors, each one optimal for its own application. The basic principle is a high S/P ratio for maximum energy savings and clear sights.

Innolumis mesopic LED lighting are available in three spectrums, or light colors:

Golden Green, Moonlight and White Moonlight.


This color is made with green and red LEDs and has a soft golden-green hue. Golden Green is mostly used in environments where the green character is accentuated, such as outdoor areas, wooded areas, parks and in the countryside.


Moonlight is our 'intensified moonlight' and is made with blue, green and red LEDs. Moonlight provides white light with a touch of green through it. Suitable for several applications in outdoor areas, roads, cycle paths and residential areas.


The White Moonlight light source is whiter than the Moonlight by using a different combination of the blue, green and red LEDs. Colors in the public space and on the road are extra accentuated, resulting in a high degree of color recognition. The White Moonlight can be used in every situation, but works very well in urban areas.

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