Search Light ....

jimmy_the_builder said:
Surely it's physically impossible to generate 3000w of light output from 1500w of power input, no?
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It is actually rather normal that a more modern technology uses (MUCH!) less current to produce the same lumens of an halogen bulb.
Just think of LED bulbs - their efficiency is much higher than anything halogen.
Not sure about the xenon/halogen ratio, but I wouldn't be surprised if the former is twice efficient than the latter.

Ref. jrudge question, fwiw I'm firmly in the "useless bit of kit" camp.
I've always had a search light in all my boats (bar the smaller lake toys), and the only occasion I can think of when I used one in thirty years or so is when a donkey was screaming at night along the coast of a Croatian island where I was anchored, in the hope to scare the animal and make it move elsewhere.
And even then, it was useless: eventually, I had to use the machine gun.
...only joking... Though I did wish to have one onboard, in that occasion! :rolleyes:
 
MapisM said:
?......the only occasion I can think of when I used one in thirty years or so is when a donkey was screaming at night along the coast of a Croatian island where I was anchored, in the hope to scare the animal and make it move elsewhere.
And even then, it was useless: eventually, I had to use the machine gun.
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:D I liked that.....

The way the little cheap LED's work today, then slide into your pocket, and a head torch, you have most needs covered.
 
Glad to see at least one poster read and UNDERSTOOD the post, and just for Mapis M I will explain a little.

Any light source relies upon a number of elements to come together and these are the original light intensity, the light colour, the reflector design, and the lens design.

Light intensity is basically the amount of light any source generates and this is coupled to the light colour, a xenon light source can come in a range of colours or rendering and most Xenon lighting for higher powered applications comes in at around 6500 Joules which is the colour of bright sunlight and is a blue light as the eye responds best to this colour of light, halogen is a very yellow light by comparison, so an instant upgrade which the human eye responds too.
Reflector design is crucial and it is important to get this balance correct, newer lighting systems such as Xenon, LED, and laser lighting utilise much better designs of reflectors in either a fixed reflector, a stepped reflector, or a variable reflector design and the fixed and stepped designs can be set at their optimum for any designed application, whereas a moveable reflector design has to offer the best compromise between wide angle light and spotlight and these tend to have a sweet spot which is usually at the spotlight end of the range and not at the wide angle setting.

Lens design is crucial as the reflector has to reflect the light into the lens correctly for the light to work correctly and as both the reflector and lens are rigid components, this design element is crucial to get right, or to get the best compromise over a range of light; if any of these is wrong then the light severely drops efficiency.
 
Assassin said:
Glad to see at least one poster read and UNDERSTOOD the post, and just for Mapis M I will explain a little.

Any light source relies upon a number of elements to come together and these are the original light intensity, the light colour, the reflector design, and the lens design.

Light intensity is basically the amount of light any source generates and this is coupled to the light colour, a xenon light source can come in a range of colours or rendering and most Xenon lighting for higher powered applications comes in at around 6500 Joules which is the colour of bright sunlight and is a blue light as the eye responds best to this colour of light, halogen is a very yellow light by comparison, so an instant upgrade which the human eye responds too.
Reflector design is crucial and it is important to get this balance correct, newer lighting systems such as Xenon, LED, and laser lighting utilise much better designs of reflectors in either a fixed reflector, a stepped reflector, or a variable reflector design and the fixed and stepped designs can be set at their optimum for any designed application, whereas a moveable reflector design has to offer the best compromise between wide angle light and spotlight and these tend to have a sweet spot which is usually at the spotlight end of the range and not at the wide angle setting.

Lens design is crucial as the reflector has to reflect the light into the lens correctly for the light to work correctly and as both the reflector and lens are rigid components, this design element is crucial to get right, or to get the best compromise over a range of light; if any of these is wrong then the light severely drops efficiency.
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Mate I UNDERSTOOD your previous post, it's just that what you wrote was wrong. But hey-ho, patronise away...
 
It isn't wrong, clearly you know little about lighting and how it works and this showed in your post, so more a case of you trying to defend a wrong synopsis by yourself.

If a little education on such a subject is posted it is simply that, educational, and a foundation for any other interested reader to further their education into such a subject by researching specifics for them selves, if you see it as patronising I suggest you take a look at yourself first.
 
Geez, I feel half responsible to have half inspired this fight, folks.
If I may try to compose the dispute in a way which is at risk to expanding it further, I believe you were both wrong to some extent.

Assassin said:
"a Xenon light unit which uses 1500W to power, but gives out nearly 3000W when compared to a halogen bulb".
Which is wrong because (afaik) there's no such thing as a light that "gives out" any amount of Watts.

But J, you replied:
"Surely it's physically impossible to generate 3000w of light output from 1500w of power input".
So, you also used the concept of W for measuring light output - Probably, but now I'm just guessing, because you actually understood that what Assassin meant was the equivalent light produced by a 3000W halogen bulb.

Fair and square? Well, I hope so. If not, feel free to say it was actually my fault.
Yesterday I eventually put the boat back in the water after a way too long winter and the sun is shining, so I'm happy to play scapegoat, if that helps! :cool:
 
Elecglitch said:
+1. Well what I understood was that he has no idea of the definition of either the Joule or the Watt.
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Watts is volts time amps. So Watts are finite. You can only "create" them with more volts or amps.

Light ( I think? ) Is measured in lumens so as with LED lights you have say a 7w that is sold as a 50w equivalent light output as the man in the street ( which includes me) will have no concept of the lumens of a halogen.

So a bulb that has twice the output of the other for the same current I think we can all understand, but you are not going to generate Watts.

Even so please bear in mind that anyone who has a 1500w bulb on a 24v system is pulling 62 Amps which for a lighting circuit must be an all time record!
 
markc said:
You owe us a lot of photos P!
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Here's one from me taken a few mins ago.

IMG_20180615_122902.jpg
 
markc said:
You owe us a lot of photos P!
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Your wish my command, M.
Actually, I'm still a few days away from being able to post pics in a proper sea environment, but time being here's a small appetizer... :cool:

Still in the shed, as of yesterday morning:
4YwVuavc_o.jpg


On her way to be launched:
kvRvO12N_o.jpg


And eventually, in her temporary river berth.
With apologies if there's still a bit of a mess in the cockpit and elsewhere, we have now a long list of ToDos before eventually heading South...
wMPEV030_o.jpg
 
Woohoo, that’s an awesome sight! All the best with the big cruise once you get going.

You have probably already mentioned this, and apologies for missing it if you have, but are you keeping the old name, or renaming her? I don’t recal a discussion regarding illuminated letters :).
 
scubaman said:
I don’t recal a discussion regarding illuminated letters
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LOL, there are three topics which you will never read posted by myself:
- AnCam
- U/w lights
- Illuminated names
Though probably not long ago I would have included planing boats in this list, so what do I know...? :rolleyes:

Anyhow, yep, her original name is a keeper.
"Lido Blu" it is, which reminds of the Venice Lido, a very pretty place home of the Film Festival.
And also not far from the historical DP yard, which was right in Venice.
 
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