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GB/T 8417-2003Colours of light signals (English PDF)

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine

Level / Type

National · Recommended

Issue date

January 10, 2003

Implementation date

June 1, 2003

Scope

GB/T 8417-2003 (Colours of light signals) is available as an English-translated PDF.

GB/T 8417-2003 - 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.

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Document preview — GB/T 8417-2003

National Standard of the People's Republic of China

ICS
13.180
Classification
A 26

Issued by: General Administration of Quality Supervision, Inspection and Quarantine

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

Foreword

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.

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 (dohm) along a given direction, the

ratio between the emitted light flux (dphi) from the light source and this solid angle.

I = dphi/dohm

Where.

I - The luminous intensity of the light source along a given direction, cd;

dphi - The emitted light flux of the light source along a given direction, lm;

dohm - 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

Where.

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

......

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 18 pages — is available in the English PDF.

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