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GB/T 8417-2003 PDF in English

GB/T 8417-2003 (GB/T8417-2003, GBT 8417-2003, GBT8417-2003)
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GB/T 8417-2003: PDF in English (GBT 8417-2003)

GB/T 8417-2003
ICS 13.180
A 26
Replacing GB/T 8417-1987
Colors of light signals
Issued by. General Administration of Quality Supervision, Inspection and
Standardization Administration of PRC.
Table of contents
Foreword ... 3 
CIE foreword ... 4 
Introduction ... 5 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
3.1 Luminous intensity ... 7 
3.2 IIIuminance in the plane of the observer's eye ... 7 
4 Requirements ... 7 
4.1 Color of light signal ... 7 
4.2 Chromaticity area range ... 8 
4.3 Red light signal color ... 14 
4.4 Yellow light signal color ... 15 
4.5 White light signal color ... 16 
4.6 Green light signal color ... 16 
4.7 Blue light signal color ... 17 
5 Test method ... 18 
This standard, through reference, adopt the International Commission on Illumination
standard CIE DS 004.4/E-1998 “Colors of light signals”. This standard is the revision
of GB/T 8417-1987 “Colors of light signals”. As compared with the original standard,
this standard adds the foreword, CIE foreword, and introduction; in the chapter of
Scope, ADD the allowable color of the flash signal AND the color selection for the signal
light, warning light, and monitor on the indication instrument panel; ADD the normative
references, terms and definitions; it is required for the chromaticity scope to follow the
new provisions of the new CIE standard; the chromaticity scope of red, yellow, green,
blue, and white is changed, AND blue is deleted; ADD the test methods.
This standard shall, from the date of implementation, replace GB/T 8417-1987.
This standard was proposed by AND shall be under the jurisdiction of National Color
Standardization Technical Committee.
This standard was responsibly drafted by the Communication and Signal Research
Institute of China Academy of Railway Sciences.
The main drafters of this standard. Wang Donghua, Wang Yachun, Zhang Xueyu.
The previous standard replaced by this Standard is as follows.
-- GB/T 8416-1987.
Colors of light signals
1 Scope
This standard specifies the chromaticity area range and test methods for the color of
the light signal (including the flash signal).
This standard applies to signal lights used in ocean, inland waterway, road, aviation,
and railway transport system, including the signal lights used in ships, cars, aircraft
and trains.
The standard also applies to the signal lights and monitors on the industrial control
monitoring instrument panel.
This standard does apply neither to automotive headlamps and fog lamps, nor to the
light source of very low color temperature which is used in maritime lights.
2 Normative references
The following documents contain provisions which, through reference in this text,
constitute provisions of this International Standard. For dated references, all
subsequent amendments, including corrigenda or revisions, are applicable to this
standard. However, parties to agreements based on this standard are encouraged to
investigate the possibility of using the most recent versions of these documents. For
undated references, the latest version applies to this standard.
The provisions in following documents become the provisions of this standard through
reference in this standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this standard; however, parties who
reach an agreement based on this standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 5697 Illuminated terminology for human engineering
GB/T 5698 Glossary of color terms
GB/T 3977 Specification of colors
3 Terms and definitions
The terms and definitions as determined in GB/T 5697 and GB/T 5698 AND below
apply to this standard.
3.1 Luminous intensity
It refers to, within the range of the solid angle (dΩ) along a given direction, the
ratio between the emitted light flux (dφ) from the light source and this solid angle.
I = dφ/dΩ
I - The luminous intensity of the light source along a given direction, cd;
dφ - The emitted light flux of the light source along a given direction, lm;
dΩ - The solid angle containing a given direction, sr.
3.2 IIIuminance in the plane of the observer's eye
It refers to the illuminance in the plane of the observer’s eye.
E = ITd/d2
E - The illuminance in the plane of the observer’s eye, lx;
I - The luminous intensity of the light source along the direction of the
observer's eye, cd;
d - The distance between the observer and the light source, m;
T - The transmittance of light in air for the unit distance.
4 Requirements
4.1 Color of light signal
The color of the light signal is red, yellow, white, green and blue; AND it is not allowed
to use other colors.
Figure 5 Chromaticity area the blue light signal colors drawn on the CIE 1931
chromaticity diagram (x, y)
4.5 White light signal color
4.5.1 Category A
Except for the conditions as specified in 4.5.2, the white light signal color must be within
the chromaticity range IJKL.
4.5.2 Category B
When the following conditions occur, the white light signal color must be in the
chromaticity area IJJ'K'KL.
a) In the same signal system, there is no yellow signal;
b) The signal does not need to be distinguished from extraneous background yellow
light, such as sodium lamps and low-temperature incandescent lamps used in
road lighting;
c) The distance between the observer and the signal is less than 5 km;
d) The signal will not be greatly attenuated by air pollution or bad weather.
Note 1. If possible, the white and yellow signals shall not be used in the same signal
system, as the two colors can easily be confused with each other, especially in
remote or low visibility conditions. If white and yellow signals must be used at the
same time, only category A white light can be used.
Note 2. When viewed from a distance, the color of the white light will shift to orange-
yellow, due to the attenuation caused by the air, AND it occurs even when the air is
clean. When air pollution or bad weather causes a decrease in visibility, this shift
will be particularly evident. In the case of reduced visibility, the chromaticity
coordinates of the white signal used must be close to the boundary IL.
Note 3. Decreasing the voltage to darken the white signal will cause the color of the
signal to shift from orange to yellow. In the overall darkening process, the color of
the signal must be in the range IJKL (for category A) or IJJ'K'KL (for category B).
4.6 Green light signal color
4.6.1 Category A
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.