VS - Lighting Systems - Lighting - 998542

Incandescent lamp H7 - 12 V 55 W 1500 lm @ 55 W = 27 lm/W

100

100

25 lm/W

80

80

60

60

5.3.5. The luminous efficacy

40

40

Relative power

Relative power

20

20

Efficacy (lm/W)

0

0

400

500

600

700

800

400

450

550

650

750

45

Colour wavelength (nm)

Xenon lamp (HID) D4S - 42 V 35 W 3050 lm @ 35 W = 87 lm/W

400 As for all systems fitted in cars, efficiency optimization also applies to light sources. It is an important factor in overall efforts to improve energy consumption and reduce vehicle CO 2 emissions. LEDs efficacy (>100 lm/W) overpasses today the Xenon technology; it makes LED designs perfect candidates for many new applications. 0 40 Incandescent lamps radiate a lot of heat (infra red) which decreases the proportion of the visible radiation over the entire radiation, their efficacy is quite poor (25 lm/W). 80 The luminous efficacy is expressed in lumens per watt, it is the ratio between the total luminous flux emitted (Lumens) by the total amount of electrical power (Watts) it consumes. 450 500 550 600 650 700 750 Colour wavelength (nm) Relative power Luminous efficacy is a figure of merit for light sources; it is the "proportion" of visible radiations over the entire radiation emitted by this light source. 20 60 100

100

100

90 lm/W

80

80

60

60

40

40

Relative power

Relative power

20

20

0

0

800

400

500

600

700

800

400

450

550

650

750

450

Colour wavelength (nm)

LED module OSLON Black Flat - KW H2L531.TE 800 lm @ 6.5 V- 1 A = 123 lm/W

100

100

80 Higher efficacy ➜ Same luminous flux with lower electrical power consumption.

> 100 lm/W

80

60

60

40

40

Relative power

Relative power

20

20

0

0

700

800

400

500

600

700

800

400

500

600

700

800

650

750

450

550

650

750

450

550

650

750

h (nm)

Colour wavelength (nm)

Colour wavelength (nm)

17