SuperFlux LEDs in Automotive

Application Brief AB201 (5/04)

7

Note that not all luminous intensity points in Table 1.1 are

specified. Therefore, the first step in calculating the minimum

luminous flux is to estimate the luminous intensity values for

the unspecified coordinates (e.g., 5L, 5U and 15L, 10U). A

reasonable assumption is that the luminous intensities of the

unspecified points are equal to the average values of the

luminous intensities of the four adjacent points. Using these

assumptions, the minimum luminous intensities of all of the

unspecified points are shown in Table 1.2. Next the zonal

constant integration is calculated by adding the luminous

intensity values in each horizontal band (e.g., 10U, 5U, etc.)

and multiplying by the zonal constant. Finally, the total lumi

nous flux of the signal lamp is simply equal to the sum of the

luminous flux values for each horizontal band. For example,

referring to the 10U row of Table 1.2, the luminous flux

emitted within the horizontal band (from 7.5° to 12.5°) is

equal to:

V

V

V

2

2

(1 10

17

24

26

42

26

24

4

17

10

1)

cos (10 )

72

(1 10

17

24

26

42

26

24

17

10

1) (0.00750)

(198) (0.00750)

1.48lm

Φ ≅ +

+

+++++

⎛⎞

π

++

+

°

⎜⎟

⎝⎠

Φ ≅ +

+

+++++

++

+

Φ≅

≅

T

Ta

ab

blle

e 1

1..1

1 M

Miin

niim

mu

um

m p

ph

ho

otto

om

me

ettrriic

c d

de

es

siig

gn

n g

gu

uiid

de

elliin

ne

es

s ffo

orr a

a s

siin

ng

glle

e c

co

om

mp

pa

arrttm

me

en

ntt a

am

mb

be

err rre

ea

arr ttu

urrn

n s

siig

gn

na

all.. A

Allll v

va

allu

ue

es

s iin

n tth

he

e

tta

ab

blle

e a

arre

e iin

n c

ca

an

nd

de

ella

a ((c

cd

d)).. N

No

otte

e:: M

Ma

ax

xiim

mu

um

m llu

um

miin

no

ou

us

s iin

ntte

en

ns

siitty

y a

att a

an

ny

y p

po

oiin

ntt iis

s 7

75

50

0 c

cd

d..

2

20

0L

L

1

10

0L

L

5

5L

L

V

V

5

5 R

R

1

1 0

0 R

R

2

2 0

0 R

R

1

10

0U

U

26

26

5

5U

U

15

50

110

50

15

H

H

65

130

130

130

65

5

5D

D

15

50

110

50

15

1

10

0D

D

26

26

T

Ta

ab

blle

e 1

1..2

2 Z

Zo

on

na

all c

co

on

ns

stta

an

ntt iin

ntte

eg

grra

attiio

on

n o

off m

miin

niim

mu

um

m p

ph

ho

otto

om

me

ettrriic

c d

de

es

siig

gn

n g

gu

uiid

de

elliin

ne

es

s ffo

orr a

a s

siin

ng

glle

e c

co

om

mp

pa

arrttm

me

en

ntt a

am

mb

be

err

rre

ea

arr ttu

urrn

n s

siig

gn

na

all.. N

No

otte

e:: P

Pa

arre

en

ntth

he

es

se

es

s iin

nd

diic

ca

atte

e e

es

sttiim

ma

atte

ed

d m

miin

niim

mu

um

m llu

um

miin

no

ou

us

s iin

ntte

en

ns

siitty

y o

off u

un

ns

sp

pe

ec

ciiffiie

ed

d p

po

oiin

ntts

s..

Z

Z o

o n

n a

a ll

F

F ll u

u x

x

2

25

5L

L

2

20

0L

L

1

15

5L

L

1

10

0L

L

5

5 L

L

V

V

5

5R

R

1

1 0

0 R

R

1

1 5

5 R

R

2

2 0

0 R

R

2

2 5

5 R

R

S

S u

u m

m

C

C o

o n

n s

s tt a

a n

n tt

llm

m

1

15

5U

U

(1)

(2)

(2)

(3)

(4)

(3)

(2)

(2)

(1)

20

7.36e3

0.15

1

1 0

0 U

U

(1)

(10)

(17)

(24)

26

(42)

26

(24)

(17)

(10)

(1)

198

7.50e3

1.48

5

5U

U

(1)

15

(30)

50

(79)

110

(79)

50

(30)

15

(1)

460

7.59e3

3.49

H

H

(2)

(20)

(39)

65

130

130

130

65

(39)

(20)

(2)

642

7.62e3

4.89

5

5D

D

(1)

15

(30)

50

(79)

110

(79)

50

(30)

15

(1)

460

7.59e3

3.49

1

10

0D

D

(1)

(10)

(17)

(24)

26

(42)

26

(24)

(17)

(10)

(1)

198

7.50e3

1.48

1

15

5D

D

(1)

(2)

(2)

(3)

(4)

(3)

(2)

(2)

(1)

20

7.36e3

0.15

T

To

otta

all,, llm

m

1

15

5..1

13

3

Using a similar approach, zonal constant integrations for

most commonly used automotive signal lamps were calcu

lated and are shown in Tables 1.3 and 1.4. The minimum

luminous flux requirements for U.S. signal lamps are shown

in Table 1.3. The minimum luminous flux requirements for

European signal lamps are shown in Table 1.4. The values

shown are based on the minimum photometric guidelines for

single compartment lamps.

The specifications for U.S. motor vehicle signal lamps are

written by the Society of Automotive Engineers (SAE). These

publications are published in SAE publication HS34 titled

SAE Ground Vehicle Lighting Standards Manual, which is

updated annually. The primary signal lamp specifications for

passenger cars are as follows:

SAE J222

Parking Lamps (Front Position Lamps)

SAE J585

Tail Lamps (Rear Position Lamps) For Use

on Motor Vehicles Less Than 2032 mm in

Overall Width

SAE J586

Stop Lamps for Use on Motor Vehicles Less

Than 2032 mm in Overall Width

SAE J588

Turn Signal Lamps for Use on Motor Vehicles

Less Than 2032 mm in Overall Width

SAE J592

Clearance, Side Marker, and Identification Lamps

SAE J914

Side Turn Signal Lamps for Vehicles Less Than

12 m in Length

SAE J1319 Fog Tail Lamp (Rear Fog Light) Systems

SAE J1957 Center High Mounted Stop Lamp Standard for

Vehicles Less Than 2032 mm in Overall Width

SAE J2087 Daytime Running Lamps For Use on Motor

Vehicles