Eclairage LED PROXIMAL : sports équestres

Fundamentals of light

Light is an electromagnetic wave that spreads in space and time.
Visible light is within a narrow segment of the electromagnetic
radiation spectrum like radio waves, radars, microwaves,
infrared, ultraviolet and X-rays.

Light can be defined as any radiation generating immediately
a visual sensation. The light wave is characterized by
its amplitude and wavelength (see Fig.1)


PROXIMAL: equine LED lighting - Light wavelength
PROXIMAL: equine LED lighting - Visible spectrum
Fig.2 – Visible spectrum of light
(Source: Thesis “Characterization of the color rendering of LED”- Dr. Nicolas POUSSET)

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Some notions and photometric dimensions


The white light

It is as well emitted by the sun as by an artificial source of lighting (bulb, light fixture).

It is formed by the “association” of a set of radiations, a mixture of colours.

Fig.3 – Rainbow: natural decomposition of white light
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The light perceived as white can be synthesized by adding the three primary colours to which the human eye is sensitive: red, blue and green.

We speak here of so-called additive synthesis by trichromy.

Fig.4 – Primary colors – RGB system.

Luminous flux en illuminance


THE LUMINOUS FLUX describes the amount of light emitted by a light source.

The unit of measure is the lumen (lm).

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ILLUMINANCE describes the density of luminous flux at a point on a surface. It decreases with the square of the distance.

The unit of measurement is lux (lx) or lm / m². 1lx = 1 lm / m².


Luminous intensity

Describes the amount of light emitted in a given direction.
It is largely determined by flux guide elements, reflectors for example
and is represented by the photometric curve.

The unit of measure is Candela (cd).



The only photometric quantity perceived by the eye.

It determines the luminosity of a surface and strongly depends on the reflection index (color and surface). The unit of measurement is cd/m².


Luminous efficacy

This is the ratio of the luminous flux by the quantity of electrical energy consumed (lm/W). It indicates how much light you get for the power you use.

Unit of measure is lumen per Watt (lm/W).


Correlated Colour Temperature

Correlated Colour Temperature (K), simplified by language abuse as Color Temperature,
characterizes the apparent color of the light emitted by the source.

It allows to define warm (2500 K) to cold (<5000 – 5300 K) light ambiances.

Fig.9 – Visual representation of Correlated Color temperature