BS 1376:1974

Cooperating organizations
Foreword
Section 1. General
1 Scope
2 References
3 Definitions
4 General introduction
Section 2. Colours emitted by light signals
5 General
6 Ranges of colours
7 Limits of chromaticity of light signals
8 Choice of restricted colour limits
9 Colour stability
10 Effects of the atmosphere
11 Effect of temperature of operation
Section 3. The production of coloured light
12 General
13 Self-coloured light sources
14 White light sources with colour filters
15 White light sources
16 Colour filters for general purposes
17 Colour filters for specific purposes
18 Choice of filter materials
19 Dimming of light sources
20 Transmittancy of colour filters
Section 4. Photometric and colorimetric measurement
21 General
22 Complete signal equipments
23 Colour filters
24 Transmittancy
Appendix A Stability
Appendix B Approximate inspection method for colour filters
Appendix C Notes on Figure 4-Figure 15
Appendix D Comparison with international standards
Publications referred to

Colour of light emitted by signalling equipment. Includes performance requirements for plastics filters and a new method of presentation of data for both glass and plastics filters.

This British Standard specifies the colours of light signals for all purposes. While it has been based on requirements for transport signalling it is equally applicable to signal colours for other purposes, e.g. indicating lights.

Guidance on means of achieving these colours and of maintaining the performance of signals is also provided.