underwater light corrosion

MarieK said:
Daka can you point me in the direction of solar cockpit lights please?
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from £15

All my wires are concealed in the canopy frame, I have 20 blue globes that illuminate the whole cockpit (canopy in or open).

The solar panel ( 12inch x 4inch ) is on the radar arch.

I dont see how absorbing the suns light during the day and releasing it at night can cause any harm to the environment. ;)

Loads here

http://shop.ebay.co.uk/i.html?_trkp..._nkw=solar lights&_trksid=p3286.c0.m14&_pgn=2

I've just realized there is a way to turn mine off at night, I could shine a high power spot light at the solar panel so it thinks it is day time.
 
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oldgit said:
Mr Astronomers rather worrying :) solitary hobby does not have a detrimental effect on any other living soul
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I may be misundersanding, but it does. What you're proposing is that in order for Mr A to see the night sky, it is right that everyone else should reduce their light polution. The nearby football match shouldn't have stadium floodlights, advertisers and the local chinese takeaway shouldn't use neon lights, and boaters shouldn't do turquoise nighttime swimming, so that all the Mr As can see the sky (without flying to Chile!)
 
MapisM said:
Just curious, why?
I would think that while swimming towards the boat, deeper lights should be less annoying to the swimmer eyes.
Besides, in the higher position, wouldn't they be covered by the swim platform whet it's lowered?
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They're easier to clean Mapis and it seems to have no impact on performance. Also, on both the Sq58 and 78 it allows the lights to be above the "rudder board" which is better for maintenance. The rudder board is a thick piece of plywood set into the GRP across the inside of the transom, like a shelf, that supports the top of the rudder tubes and to which the power steering ram etc is bolted. In small waves the lights can break the surface but this is no problem for swimmers - I can't explain why but I've swum towards them at night as they break the surface and it just isn't a problem

Ref the swim platform, it is no problem. The Sq78 platform has a very pleasing mechanism and a big up/down stroke. It lowers a long way, down to the tops of the prop tunnels, so it will always "catch" the lights in one position or another. See this pic of my boat (this shows the stabs too; for scale the radar scanner is 4 foot, but if we want to discuss that let's take it to another thread!). When recovering the tender at night, the u/w lights (which will be above the platform when it is lowered) will be very useful in allowing me to see what's happening, and line up with the chocks and avoid stubbed toes (so they have a practical function too!)

profiledrawing.jpg
 
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"Loads here

http://shop.ebay.co.uk/i.html?_trkpa....c0.m14&_pgn=2"

Thanks for that Daka

I never knew there was so much choice ! Not sure which ones to choose now

Do I go for the rocklights ?
or the mushroom light ?
Or the puppy lights ?
No I think its the hedgehog lights for me
 
jfm said:
on both the Sq58 and 78 it allows the lights to be above the "rudder board" which is better for maintenance.
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Aha, I see. That reason alone is good enough.

Btw, I was going to suggest also to the OP (who said he couldn't check the ground connection because the boat is in the water) to check it from the inside. I know nothing of the u/w light he's mentioning, but surely the part of the body which SHOULD be accessible from inside must be the same as (or perfectly connected to, anyway) the external part.

As an aside, I can't get my head around the usefulness/pollution debate.
I mean, obviously Searush is correct when he says that u/w light are rather a bling than an essential equipment. But I'm sure that none of us, if forced by a restricted budget to choose between either u/w lights or say safety jackets, would go for the latter!
And I don't disagree also with oldgit, light pollution is ...ermm... pollution (as you also agreed in your post #13), whilst the astronomer doesn't harm anyone (eventually, restricting the freedom to pollute is because of other pollution consequences, not because of the astronomer's hobby). But in this respect, shouldn't we ban all pleasure boats, before caring about u/w lights? Sailboats included, btw. They also contribute to pollution, in more than one respect - though obviously less than MoBos, AOTBE.
 
MapisM said:
And I don't disagree also with oldgit, light pollution is ...ermm... pollution (as you also agreed in your post #13), whilst the astronomer doesn't harm anyone (eventually, restricting the freedom to pollute is because of other pollution consequences, not because of the astronomer's hobby). But in this respect, shouldn't we ban all pleasure boats, before caring about u/w lights? Sailboats included, btw. They also contribute to pollution, in more than one respect - though obviously less than MoBos, AOTBE.
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What next ?
DDT the rain forest to reduce pollution from Fireflys .
 
JFM

I have tried to do what you suggest the back of the light is a 32mm thread with a big nut on it and a load of sikaflex. to attact the wirte to the back of the light I had 2 ideas.

plan a, drill into the nut 3mm and tap it then screw a wire bond on to it. cant do this as the metal very strong and the angle of drilling is close to parts so not a lot of room.

Plan b, was to see if solder would stick to a rough area after I rub it with a file.

neither have worked so I have 2 more plans, to attach a jubille clip around the nut tightly and attach a wire to that, or use a crocadile clip and clamp it to the nut.

would either of those ideas work or cause a problem?

Thanks
 
SolentPhill said:
JFM

I have tried to do what you suggest the back of the light is a 32mm thread with a big nut on it and a load of sikaflex. to attact the wirte to the back of the light I had 2 ideas.

plan a, drill into the nut 3mm and tap it then screw a wire bond on to it. cant do this as the metal very strong and the angle of drilling is close to parts so not a lot of room.

Plan b, was to see if solder would stick to a rough area after I rub it with a file.

neither have worked so I have 2 more plans, to attach a jubille clip around the nut tightly and attach a wire to that, or use a crocadile clip and clamp it to the nut.

would either of those ideas work or cause a problem?

Thanks
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Ah, so your lights do not have an earthing screw on the inside. In those circs I would be inclined to use the jubilee clip idea, around the body of the light. You can buy jubilee clips with an earthing clamp screw built-in. I think this would work perfectly well

When you are done, you should be able to find the bolt heads for the anodes inside the boat as MapisM said. You can therefore test electrical resistance from the light body to these boltheads. All sounds like it should work fine. Good luck
 
MapisM said:
As an aside, I can't get my head around the usefulness/pollution debate.
I mean, obviously Searush is correct when he says that u/w light are rather a bling than an essential equipment. But I'm sure that none of us, if forced by a restricted budget to choose between either u/w lights or say safety jackets, would go for the latter!
And I don't disagree also with oldgit, light pollution is ...ermm... pollution (as you also agreed in your post #13), whilst the astronomer doesn't harm anyone (eventually, restricting the freedom to pollute is because of other pollution consequences, not because of the astronomer's hobby). But in this respect, shouldn't we ban all pleasure boats, before caring about u/w lights? Sailboats included, btw. They also contribute to pollution, in more than one respect - though obviously less than MoBos, AOTBE.
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Yup, it's a tricky one. Searush is right, but then the whole of a pleasure boat is bling so where do you draw the lines?

Light polllution is complex. Arguably, anyone who makes say 500m pa unnecessary car journeys at night is a bigger light polluter than my boat. It's very hard to see where to draw the lines. Under English law, as a land owner you own a "cone" down to the centre of the earth and up to infinity. The practical consequences of that are mostly academic (unless you strike oil or gold in the cone beneath your land!) but one could argue that folks are free to light-pollute in the cone above. Astronomers are looking "through" other people's space and arguably have no right to expect it to be kept dark just for them. And so on: there are no easy answers
 
"Before you order do you want to check if they also come in green and perhaps we can share a set , red for the left hand side and green for the right (might be the other way round, I can never remember, best check before you fit them)."

What about stern light ? Rocklight ?
And Anchor light ? I suggest hedgehoglight to stop anyone mooring on top of you

Good plan Pete, perhaps we could ask for Colregs to be changed to accomodate our lates plans
 
MapisM said:
But I'm sure that none of us, if forced by a restricted budget to choose between either u/w lights or say safety jackets, would go for the latter!
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Whoops, I just realised the typo.
The above was obviously meant as "...would go for the first!"

And before anyone mention it, nope, not a freudian slip! Anyone who remember my personal u/w light setup for night swimming, that I already explained in the past, surely will appreciate that I'm not a fan of bling equipment, generally speaking.
Which doesn't mean that I have anything against those who like them, otoh.
 
why should the wishes of Mr A (the amateur astronomer) prevail over the wishes of Mr B (the boater who wants a party night with his friends swimming in a turquoise-lit sea, on the same evening)? Clearly it isn't possible for both Mr A and Mr B to be happy that evening, as their wishes/happiness conflict.
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Au contraire, if Mr B - whose boat has a high OB quotient - isn't prepared to turn the lights up to 11 then Mr A isn't going to be able to get such an eyeful. Unless telescope technology has moved on from my day.

So, lights on: everyone very happy
 
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benjenbav said:
Au contraire, if Mr B - whose boat has a high OB quotient - isn't prepared to turn the lights up to 11 then Mr A isn't going to be able to get such an eyeful. Unless telescope technology has moved on from my day.

So, lights on: everyone very happy
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Excellent observation BJB. And in my experience with OBs and u/w lights, they tend to be nekkid. Several of them, all at once. And on the new boat I can scoop them out of the sea hydraulically and not offer them towels. Way to go...
 
All street lighting and suspect stadium lighting too,has now to meet some very strict regulations regarding the amount and type of light given out,in order to minimise its affects on the surrounding area and not waste energy.
 
oldgit said:
All street lighting and suspect stadium lighting too,has now to meet some very strict regulations regarding the amount and type of light given out,in order to minimise its affects on the surrounding area and not waste energy.
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So you're saying that street lighting and stadium lights are ok because they have to meet these regulations, whereas boat lighting isn't because it doesn't?
 
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