This is the final instalment in our short three part series discussing Light.
Colour
Definition and Measurement
Standard Colour Definitions & Meaning
Whilst we are unable to find a standard that directly defines the colour coding of warning beacons or visual alarm devices (VADs) we can borrow from the existing standard BS EN 60073 – “Basic and safety principles for man-machine interface, marking and identification – coding principles for indicators and actuators”
From this standard we shamelessly borrow the table:
Colour | Safety of persons or environment | Condition of process | State of equipment |
Red | Danger | Emergency | Faulty |
Yellow | Warning/Caution | Abnormal | Abnormal |
Green | Safe | Normal | Normal |
Blue | Mandatory significance | ||
White (Grey or Black) | No specific meaning assigned |
This standard does not directly define what is meant by the individual colours in terms of chromaticity – for example what do we mean by red? Instead it refers us to CIE publication No. 2-2 1975 – “Colours of light signals” which has now been superseded by standard CIE S 004/E-2001 – “Colours of light signals”. Here may be found exact definitions of what constitutes Red, Yellow, Green, Blue and White light signals.
Summary
This is the final instalment of the three part series discussing various properties of light. We very briefly looked at Colour and its measurement as well as how we can usefully apply colour to signalling situations in a uniform standardised manner.
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