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Old 25-09-2018, 16:13   #61
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Re: Running lights - does size matter?

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Originally Posted by LongRange View Post
That's because flux intensity is not the same thing as luminosity, which is indeed measured in watts.

Flux intensity is a function of the detector's spanned angle. Luminosity is the total power output of the device.

But "total power output" is irrelevant. Who cares about how much IR and UV a nav light puts out?
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Old 25-09-2018, 16:23   #62
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Re: Running lights - does size matter?

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Originally Posted by Cadence View Post
Since a lumen is the amount of light from one candle. How many candles do I need to light? :-)

For a "2 mile light", you need 4.3 candela according to COLREGs Annex I.
For 3 mile, you need 12.


As a rule of thumb, you can "sort of" equate candela with the light from a single candle.
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Old 26-09-2018, 07:19   #63
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Re: Running lights - does size matter?

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Originally Posted by StuM View Post
For a "2 mile light", you need 4.3 candela according to COLREGs Annex I.
For 3 mile, you need 12.


As a rule of thumb, you can "sort of" equate candela with the light from a single candle.
I was asking that in jest. The average boater does not have the equipment to measure light intensity. Maybe an old photographer that used silver might?
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Old 26-09-2018, 07:45   #64
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Re: Running lights - does size matter?

1. Get a piece of insanely expensive teak, and mount it on the existing mounting holes, and then get the brightest lights you can find, and use good old fashioned wood screws, properly predrilled holes in the wood, and you will be able to get under and behind the fixture, and replace bulbs or whatever forever. The newer technologies allow boat to be seen farther away, always a good idea. You may eventually have to varnish the teak.

2. I went with a sailing light topmast for open water, and a second set of lights 6-7 foot off the water for harbors. This gives me least electrical use while at sea, and greatest distance view while at sea, and then easiest to see and judge boat size lights while in a crowd.
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Old 27-09-2018, 19:56   #65
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Re: Running lights - does size matter?

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Originally Posted by redbeard1 View Post
Hello,


FYI, We ran across this warning from the coast guard when debating switch to LEDs.



https://www.dco.uscg.mil/Portals/9/D...-16-091109-630
Hmmm, very interesting... thanks
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Old 27-09-2018, 20:37   #66
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Re: Running lights - does size matter?

Recent observation:

Approaching Fraser Island at night from the NE... I was surprised to see some lights about where the island should have been. Upon scanning with binoculars, I saw the anchor lights from around 8 boats at a distance of 8.6 miles according to the AIS from a couple of them. Only a couple were visible to my naked eyes (but those are kina dim due to advancing cataracts), but they popped right up with the binocs, and by around 6 miles they were visible unaided.

I thought that was pretty outstanding. From the color, they were all LEDs.

Jim
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Old 29-09-2018, 03:57   #67
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Re: Running lights - does size matter?

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Originally Posted by StuM View Post
But "total power output" is irrelevant. Who cares about how much IR and UV a nav light puts out?
When postulating an increasingly powerful source, compared to an original, it is luminosity that is being discussed.

The percentage of that power that is emitted in IR or UV (or gamma) is not going to change appreciably, for a given type of light. Higher luminosity achieves correspondingly higher output in the visible spectrum.
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Old 29-09-2018, 04:18   #68
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Re: Running lights - does size matter?

Quote:
Originally Posted by LongRange View Post
When postulating an increasingly powerful source, compared to an original, it is luminosity that is being discussed.

The percentage of that power that is emitted in IR or UV (or gamma) is not going to change appreciably, for a given type of light. Higher luminosity achieves correspondingly higher output in the visible spectrum.

I refer you to Weim's Displacement Law.
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Old 29-09-2018, 06:26   #69
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Running lights - does size matter?

Quote:
Originally Posted by Nicholson58 View Post
Marinebeam has replacement bulbs for your Aquasignal tricolor

https://store.marinebeam.com/indexed...s-bay15d-base/


I would be very cautious about putting an LED bulb in a fixture designed for incandescent bulbs, particularly in the masthead tricolor in close proximity to your VHF antenna due to the risk of interference.

I put a Marinebeam led bulb in one of my salon reading lamps and it wreaked havoc with the boat’s stereo. Their replacement bulb for the Aqua Signal May be engineered to prevent interference but I would be suspicious. Determining If it impacts your broadcast range/clarity would be difficult to test.
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Old 29-09-2018, 16:20   #70
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Re: Running lights - does size matter?

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Originally Posted by Suijin View Post
I would be very cautious about putting an LED bulb in a fixture designed for incandescent bulbs, particularly in the masthead tricolor in close proximity to your VHF antenna due to the risk of interference.

I put a Marinebeam led bulb in one of my salon reading lamps and it wreaked havoc with the boat’s stereo. Their replacement bulb for the Aqua Signal May be engineered to prevent interference but I would be suspicious. Determining If it impacts your broadcast range/clarity would be difficult to test.
The interference associated with LEDs will not involve your transmitted signal at all. Some LEDs have had poorly engineered circuitry that generates RFI, mostly at VHF range frequencies. Nowadays there are manufacturers that have eliminated the problem, and these are quite safe to use at t he masthead. The ones that I use come from Bedazzled, a UK based firm. They have an extensive range of high quality LED "bullbs" and I have been quite happy with them. No connection, BTW... just a user.

Jim
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