Cuchilo
regular
Reged: 19/04/2003
Posts: 4515
Loc: London
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Is there such a rule as to what size nav lights need to be ?
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Dont come running to me if you fall over and break your leg .
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byron
regular
Reged: 16/05/2001
Posts: 6766
Loc: UK -Berks
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Yes! but for the life of me I cannot remember what it is.
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http://www.oceaneagle.fsnet.co.uk
www.alexander-advertising.co.uk
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Cuchilo
regular
Reged: 19/04/2003
Posts: 4515
Loc: London
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I'm trying to remember if i need one atall . If i have the Port and Stbd on a duo light was it no steaming light needed for a craft of a certain size or was it an all rounder will do as steaming and stern  I cant even remember where i read all this up many moons ago
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Dont come running to me if you fall over and break your leg .
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boatone
regular
Reged: 29/07/2001
Posts: 6767
Loc: Surrey uk
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On your boat, an all rounder will do as both steaming and stern.
If you do a google for 'navigation lights for small boats' you will find lots of info and many chandlers quote the regs as part of the specs.
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"Don't tell me why not, tell me how..."
ThamesBlog
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Cuchilo
regular
Reged: 19/04/2003
Posts: 4515
Loc: London
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Thanks Mr B1  Problem is i dont want an all rounder 
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Dont come running to me if you fall over and break your leg .
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boatone
regular
Reged: 29/07/2001
Posts: 6767
Loc: Surrey uk
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I would guess that ANY nav light available would meet the visibilty minimum for your boat so just go buy what pleases you !
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"Don't tell me why not, tell me how..."
ThamesBlog
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boatone
regular
Reged: 29/07/2001
Posts: 6767
Loc: Surrey uk
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OK....chapter and verse.....
Rule 22
Visibility of lights
The lights prescribed in these Rules shall have an intensity as specified in Section 8 of Annex I to these Regulations so as to be visible at the following minimum ranges:
(c) In vessels of less than 12 metres in length:
-a masthead light, 2 miles;
-a sidelight, 1 mile;
-a sternlight, 2 miles;
-a towing light, 2 miles;
-a white, red, green or yellow all-round light, 2 miles.
Rule 23
Power-driven vessels underway
(a) A power-driven vessel underway shall exhibit:
(i) a masthead light forward;
(ii) a second masthead light abaft of and higher than the forward one; except that a vessel of less than 50 metres in length shall not be obliged to exhibit such light but may do so;
(iii) sidelights;
(iv) a sternlight.
(b) An air-cushion vessel when operating in the non-displacement mode shall, in addition to the lights prescribed in paragraph (a) of this Rule, exhibit an all-round flashing yellow light.
(c)
(i) A power-driven vessel of less than 12 metres in length may in lieu of the lights prescribed in paragraph (a) of this Rule exhibit an all-round white light and sidelights;
(ii) a power-driven vessel of less than 7 metres in length whose maximum speed does not exceed 7 knots may in lieu of the lights prescribed in paragraph (a) of this Rule exhibit an all-round white light and shall, if practicable, also exhibit sidelights;
(iii) the masthead light or all-round white light on a power-driven vessel of less than 12 metres in length may be displaced from the fore and aft centreline of the vessel if centreline fitting is not practicable, provided that the sidelights are combined in one lantern which shall be carried on the fore and aft centreline of the vessel or located as nearly as practicable in the same fore and aft line as the masthead light or the all-round white light.
Well......you did ask.... 
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"Don't tell me why not, tell me how..."
ThamesBlog
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byron
regular
Reged: 16/05/2001
Posts: 6766
Loc: UK -Berks
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Isn't there a ruling on how many Lumins (or whatever they are called) must emit. From vague memory a minimum of 25 watts for a boat the size of yours Tony.
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www.alexander-advertising.co.uk
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boatone
regular
Reged: 29/07/2001
Posts: 6767
Loc: Surrey uk
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8. Intensity of lights
(a) The minimum liminous intensity of lights shall be calculated by using the formula;
I= 3.43 × 106× T × D2× K-D
where I is luminous intensity in candelas under service conditions,
T is threshold factor 2 × 10-7 lux,
D is range of visibility (luminous range) of the light in nautical miles,
K is atmospheric transmissivity.
For prescribed lights the value of K shall be 0.8, corresponding to a meteorological visibility of approximately 13 nautical miles.
If you really want to read every last drop its HERE in Annex 1.
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"Don't tell me why not, tell me how..."
ThamesBlog
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Cuchilo
regular
Reged: 19/04/2003
Posts: 4515
Loc: London
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Thanks for your help  ......... I think
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Dont come running to me if you fall over and break your leg .
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