
ITE: Vehicle Traffic Control Signal Heads April 1985 
ITE: VTCSH Part 2: LED Vehicle Traffic Signal Modules June 1998 
Draft European Standard: Traffic Control Equipment  Signal Heads January 1998 
Japanese Standard
April 1986 
CIE: Suggestions from Light Signals for Traffic Control 1980 
CIE: Review of the Official Recommendations for the Colors of Signal Lights 1994 
Color boundaries: Red 
0.998x<=y
y<=0.308 
0.998x<=y
y<=0.308 
y=0.290 red
y=0.980x purple
y=0.320 yellow 
0.8350.774x<=y
y<=0.335 
y=0.290 red
y=0.980x purple
y=0.320 yellow 
y=0.300
y=0.290
y=0.980x 
Color boundaries: Yellow 
0.411<=y<=0.452 0.995x<=y 
0.411<=y<=0.452 0.995x<=y 
y=0.387 red y=0.980x white y=0.727x+0.054 green 
0.9320.918x<=y 0.036+0.611x<=y y<=0.109+0.65x 
y=0.382 red y=0.7900.667x white y=x0.120 green 
y=x0.151 y=x0.206 y=0.980x 
Color boundaries: Green 
0.5060.519<=y 0.150+1.068x<=y y<=0.730x 
0.5060.519<=y 0.150+1.068x<=y y<=0.730x[2] 
y=0.7260.726x yellow x=0.625y0.041 white y=0.400 blue 
x<=0.214 0.214<=y y<=0.4990.474x 
y=0.7260.726x yellow x=0.625y white y=0.3900.171x blue 
y=0.7260.726x x=0.625y0.041 y=0.5000.500x 
Luminous intensity (cd): Red (in the reference axis) 
Min=157 (d=200 mm) Min=399 (d=300 mm)[1] 
Min=133, Max=800 (d=200 mm) Min=339, Max=800 (d=300 mm)[3] 
PL1: Min=100, Max1=400, Max2=1100[4] PL2: Min=200, Max1=800, Max2=2000 PL3: Min=400, Max1=1000, Max2=2500

Min=240[5] 
Min=200, urban and daytime 50<=intensity<=100, nighttime[6] 

Luminous intensity (cd): Yellow (in the reference axis) 
Min=726 (d=200 mm) Min=1848 (d=300 mm)[1] 
Min=617, Max=3700 (d=200 mm) Min=1571, Max=3700 (d=300 mm)[3] 
same as Red above 
Min=240[5] 
N/A 

Luminous intensity (cd): Green (in the reference axis) 
Min=314 (d=200 mm) Min=798 (d=300 mm)[1] 
Min=267, Max=1600 (d=200 mm) Min=678, Max=1600 (d=300 mm)[3] 
same as Red above 
Min=240[5] 
N/A 

Uniformity 
Intensity at each of 44 test points shall not be lower than 80% of required values. No more than 8 test points having values less than 90% of required values are allowed. 
Min:Max>=1:10 (type E,W,M) Min:Max>=1:15 (type N)[7] 

Min:Max>=1:5 

Size 
200 mm, 300 mm 
200 mm, 300 mm 
200 mm, 300 mm 
250 mm, 300 mm 
200 mm, 300 mm 

Temperature 
40 to 74 C 0100% humidity 
40 to 74 C 
Class A: 15 to 60 C Class B: 25 to 55 C Class C: 40 to 40 C 
20 to 60 C 4090% humidity 

