[PSUBS-MAILIST] Light Experiments

Sun Apr 16 20:52:55 EDT 2017

That's a beautiful housing and looks pretty bullet proof! Did you make it
yourself or have a machinist do it?

Rick

On Sun, Apr 16, 2017 at 1:39 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> High Rick,
> to insert the male subconn fitting it has to be turned 15 times as it
> winds down fully in to the thread; so the wire would be twisted 15 times if
> you went this way.
> Yes the bolts go right the way through. This avoids tapping threads & bolts
> seizing. It also has the advantage that I can have longer bolts out the
> back
> that an attachment bracket can be bolted to.
> The back section in the photo, has the led attached to it & an o-ring
> groove
> to seal against the bore of the middle section. The base of the middle
> section
> has an o-ring groove & the back section compresses this when the bolts
> are tightened up. So two o-rings on this section. The top ring that clamps
> the lens down on to an o-ring (also o-ring around the side of the lens) can
> be made a larger diameter with a second set of bolt holes so the light can
> be mounted in a recess.
> As the back section is the main heat sink & mount for the LED I don't have
> room for a bunch of twisted wires. The nozzle out back is designed so I
> can pour resin in to it, let it set, then coat the wiring about an inch up
> &
> the nozzle with silicone. Then I intend to mold a rubberised supporting
> section over the silicon. It should work!
> Pictures attached.
> Cheers Alan
> [image: image1.JPG]
>
> [image: image2.JPG]
> Sent from my iPad
>
> On 17/04/2017, at 10:08 AM, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi Alan,
>
> Thanks for the picture.
> The size housing you are using is kinda what I wanted to go with as well.
> Not sure what you mean about screwing something in 15 times. From the top
> view picture you sent, looks like the front head/lens is held on against a
> sealing surface with 6 Allan head bolts that go all the way threw the back
> plate so I assume that the back plate is threaded and screws on against an
> 0 ring or something?
>  If that's the case, can't you drill and tap the back and put a sub-Conn
> or strain relief fitting in and allow just enough length of wires to
> protrude inside just enough to connect the LED wires to it before attaching
> the lens? Do you have any pictures of everything inside the housing by them
> self's?
>
> Rick
>
> On Sun, Apr 16, 2017 at 10:39 AM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Hi Rick,
>> The light in the photos is mk 1 or 2. It didn't have oil in in those
>> photos.
>> Funny but the oil bubble & the temperature sensor had no effect on
>> the light coming out.
>>  The latest version has a conical lens machined in it & hides the
>> attachment
>> bolts for the LED.
>> Still a work in progress as I have just made enquiries regarding pressure
>> rated borosilicate glass lenses. This light is 85mm D x 54mm long.
>> (excluding
>> wiring nozzle) In the attached photo I have just temporarily siliconed
>> around
>> the wires for the test. I do have 8 subconn male & female connectors & was
>> thinking of tapping a hole for the male connector to fit. The only
>> problem is
>> how do I connect the wires? My two LED wires are either side of the LED &
>> come
>> down two separate angled holes & meet in a central 8mm hole. I would need
>> to fit the LED then attach the LED wires to the subconn wires & twist
>> them 15
>> times to thread in the subconn fitting. The subconn wires are very stiff
>> & it
>> just wasn't going to work without a large amount of room for twisted
>> wires.
>>    I have some ideas for potting the wires that I will try & test.
>> The housing diameter was dictated by stock material sizes but works out
>> well.
>> I have machined the cooling fin slots in to the bolt holes to give the
>> fins a bit
>> more depth.
>> Alan
>> <image1.JPG>
>>
>>
>>
>>
>> Sent from my iPad
>>
>> On 17/04/2017, at 5:43 AM, Rick Patton via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Alan,
>>
>> Do these pictures have the silicone oil in them? Do you have any side and
>> back shots of the housing and other data regarding the housing like wall
>> thickness and what fitting did you use to get the power out of the back and
>> such?
>>
>> Rick
>>
>> On Sat, Apr 15, 2017 at 6:33 PM, Alan via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> I put a temperature probe inside the housing of my 80W LED light.
>>> The probe was up against the acrylic lens, as I was concerned about
>>> what temperature the lens was seeing on the inside. The lens is 10mm
>>> away from the LED.
>>> The LED manufacturer told me that on normal LEDs the temperature
>>> out the front of the LED can be 338F (170C) but my flip chips should
>>> run cooler.
>>> Briefly; when run at 30W in water they stabilised at 257F after 5
>>> minutes.
>>> At 45W they stabilised at 280F after 5 minutes. I stopped upping the amps
>>> at this stage.
>>> Next experiment, I filled the housing with silicone oil.
>>> At 45W it hit 116F in 4 minutes & temperature stabilised.
>>> At 76W it hit 139F in 6 minutes & stabilised.
>>> So oil has massive advantages in lessening temperature on the lens,
>>> maybe because it is a buffer from the radiant heat & also transfers the
>>> heat
>>> out through the housing quicker.
>>> Greg your thoughts would be appreciated on this; I am thinking that
>>> without the
>>> oil the acrylic lens would see temperatures at which it is formed
>>> especially
>>> if I went up to 80W. Although the outside of the lens was cold there
>>> would be a
>>> temperature transition across the thickness of the lens & it would be
>>> considerably
>>> weakened. I am building to 500ft, so it would potentially see 250 psi in
>>> operation.
>>>    At this stage I haven't made up my mind whether to go with a
>>> borosilicate lens
>>> or oil fill with an acrylic lens. I had a large bubble & it would be
>>> hard to eliminate
>>> all bubbles in the oil filling process.
>>> Will try & attach photos.
>>> Alan
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> Sent from my iPad
>>> _______________________________________________
>>> Personal_Submersibles mailing list
>>> Personal_Submersibles at psubs.org
>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>
>>>
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