VS - Lighting Systems - Lighting - 998542

5.2. Light sources basics

Day and night-time eye sensitivity

The most natural light for human eyes is daylight.

MAX.

MAX.

The daylight is composed of a range of different colours; called a “polychromatic colour”.

507 nm

555 nm

100

This is demonstrated when light passes through a prism, it is fractured into different colours to form a spectrum.

80

CIE STANDARD EYE SENSITIVY CURVES

60

Each light source is characterized by a light spectrum showing wavelength against power for each colour.

40

Relative eye sensitivity

20

0

400

500

600

700

800

450

550

650

750

Color wavelength (nm)

Day-time

• Central field of view. • Perception of details. • Colour sensitive.

Each light source is characterized by a light spectrum showing wavelength against power for each colour.

Automotive lighting systems are designed according to the visual perception of the human eye and are developed to compensate our visual weaknesses in some driving situations. The lighting systems on vehicles have evolved enormously in the last few generations to ensure road users comfort, safety and security.

Daylight

100

80

60

40

Relative power

20

0

400

500

600

700

800

450

550

650

750

Color wavelength (nm)

9