5 FUNCTIONAL REQUIREMENTS
5.l REQUIRED FLINCTIONS AND THEIR AVAILABILITY
Daylight signaling lamps should be suitable for giving light signals, whlch can be clearIy distinguished visually as separate signals by an observer'
3.2 RELIABILITY, ACCURACY, AND DISCRIMINATION
By day and with an atmospheric transmission of 0.8, the visibillty of light signals emitted by daylight signaling lamps should be at least 2 nautical miles, equaling a required luminous intensity of 60,000 cd.
The axial luminous intensity of daylight signaling lamps should reach at least 90% of the maximum luminous intensity.
The luminous intensity of daylight signaling lamps should have its maximum in the centre of the luminous intensity distribution. It should decrease evenly from the centre of luminous intensity distribution.
The half angle of divergence αh should not exceed 9°, the tenth angle of divergence αz should not exceed l4°.
The chromaticity of the white signal light should lie within the following corner Coordinates of the diagram specified by the Internatlonal Commission on Illumination (CIE) in CIE Publication No. 2.2, 1975：
The effective light emission sectors of daylight signaIling lamps should be circular.
The sum of switch-on and switch-off times should not exceed 500 ms.
5.3 MALFUNCTIONS, WARNlNGS, ALARMS, AND INDICATIONS
Daylight signaling lamps should be provided with an indication of their operational status.
5.4 SOFTWARE REQUIREMENTS
- no requirements
6 0PERATIONAL REQUIREMENTS
6.l ERGONOMY
Day light signaling lamps and ant, battery required For operation should be designed in such a way that safe handling In the intended application is ensured. The daylight signalng lamp shouId be capable of being operated by personnel wearing gloves.
