awol
Well-Known Member
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How good is the Lopolight/Nasa style of masthead light when the boat is heeled? I have this vision of one side of the boat only being visible to aircraft, while the other is illuminating the sea surface fifty metres or so to leeward.
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The IRPCS requires [ QUOTE ]
10. Vertical sectors
(a) The vertical sectors of electric lights, as fitted, with the exception of lights on sailing vessels shall ensure that:
(i) at least the required minimum intensity is maintained at all angles from 5 degrees above to 5 degrees below the horizontal;
(ii) at least 60 per cent of the required intensity is maintained from 7.5 degrees above to 7.5 degrees below the horizontal.
(b) In the case of sailing vessels the vertical sectors of electric lights as fitted shall ensure that:
(i) at least the required minimum intensity is maintained at all angles from 5 degrees above to 5 degrees below the horizontal;
(ii) at least 50 per cent of the required minimum intensity is maintained from 25 degrees above to 25 degrees below the horizontal.
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I haven't actually taken photometric measurements but the NASA Supernova Tricolour certainly appears to exceed this and so, presumably, does the Lobo.
How good is the Lopolight/Nasa style of masthead light when the boat is heeled? I have this vision of one side of the boat only being visible to aircraft, while the other is illuminating the sea surface fifty metres or so to leeward.
[/ QUOTE ]
The IRPCS requires [ QUOTE ]
10. Vertical sectors
(a) The vertical sectors of electric lights, as fitted, with the exception of lights on sailing vessels shall ensure that:
(i) at least the required minimum intensity is maintained at all angles from 5 degrees above to 5 degrees below the horizontal;
(ii) at least 60 per cent of the required intensity is maintained from 7.5 degrees above to 7.5 degrees below the horizontal.
(b) In the case of sailing vessels the vertical sectors of electric lights as fitted shall ensure that:
(i) at least the required minimum intensity is maintained at all angles from 5 degrees above to 5 degrees below the horizontal;
(ii) at least 50 per cent of the required minimum intensity is maintained from 25 degrees above to 25 degrees below the horizontal.
[/ QUOTE ]
I haven't actually taken photometric measurements but the NASA Supernova Tricolour certainly appears to exceed this and so, presumably, does the Lobo.