Vehicle Traffic Control Signal Heads: - Institute of Transportation ...
Vehicle Traffic Control Signal Heads: - Institute of Transportation ...
Vehicle Traffic Control Signal Heads: - Institute of Transportation ...
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Figure 1<br />
Color Regions for LED <strong>Traffic</strong> <strong>Control</strong> <strong>Signal</strong> Lights<br />
Figure 1 illustrates the acceptable color regions for traffic control signal lights using LED emitters as the<br />
light source.<br />
0.35<br />
Color Region for Red <strong>Traffic</strong> <strong>Signal</strong> Lights<br />
(1931 CIE Chromaticity Diagram)<br />
0.33<br />
610<br />
Spectrum Locus<br />
Red<br />
0.31<br />
y = 0.308<br />
620<br />
y<br />
y = 0.953 - 0.947x<br />
630<br />
0.29<br />
y = 0.290<br />
640<br />
0.27<br />
0.25<br />
0.64 0.66 0.68 0.70 0.72 0.74<br />
x<br />
18
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