[PSUBS-MAILIST] LED Lights

Thu Jul 23 12:19:36 EDT 2015

Hank, I agree as long as back of LED in thermal communication with heat
sink, the bulk of the heat will be dissipated.  Let me know how the test
comes out.  Are you using the Vero 29 10,000 lumen LED?   Like Scott, I
worry about the clear potting material over the front of the LED
discoloring due to heat.  Best to just try it.

Cliff

On Thu, Jul 23, 2015 at 11:03 AM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

>
> Cliff,
> If the LED is still heat sinked to the aluminum housing, then the heat
> should still dissipate into the aluminum regardless if it is surrounded
> with air or polyurethane.  I have just potted a light and waiting for it to
> cure.  I will then submerge it in water and see what happens.
> Hank--------------------------------------------
> On Thu, 7/23/15, Clifford Redus via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>  Subject: Re: [PSUBS-MAILIST] LED Lights
>  To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
>  Received: Thursday, July 23, 2015, 9:18 AM
>
>  You
>  are right.  Should have added, unless these OTS utility
>  lights are potted or oil compensated to the qualification
>  list.  As a personal preference, I just don't like the
>  mess and maintenance associate with oil compensation
>  particularly since we are not trying to get to the depth
>  rating for commercial lights.
>  Cliff
>  On Thu, Jul 23, 2015 at
>  9:31 AM, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org>
>  wrote:
>  Hi Cliff,
>  Why not
>  an option unless potted? Scott and I are both using the very
>  light Jon posted, oil filled, and they're doing great.
>  They even come with the filler screw.
>
>  Best,
>  Alec
>  On Thu, Jul 23, 2015 at
>  10:18 AM, Clifford Redus via Personal_Submersibles <
> personal_submersibles at psubs.org>
>  wrote:
>  Jon, thanks for setting up the forum.  I am
>  assuming we can post files as well.
>   I agree low cost is important but
>  having a functioning light is as well.  OTS LED utility
>  lights like that one you noted are not an option unless they
>  can be potted.  To me the best way to keep the cost low,
>  is to publish construction drawings of a 1-atm  DIY housing
>  that a psubber could machine or have machined by a friend,
>  and publish a design of a PCB that could be easily
>  fabricated using  one of the PCB online sites like
>   ExperessPCB www.expresspcb.com and
>  DIY populate the board.  As a group, we design and build a
>  prototype that I can test in my shop. If it works as
>  designed, then we post to the psubs site a report, that
>  includes the design drawings, circuit diagram, parts list
>  and test results.
>  Getting a consciences on the design
>  spec is the first step.
>  Cliff
>  On Wed, Jul 22, 2015
>  at 10:11 PM, Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org>
>  wrote:
>
>
>  My three words of advice...cost, cost, cost.
>
>
>
>  One measure of a success for this project will be how many
>  people actually build/use it.  If it costs more to
>  manufacture than just purchasing something like
> http://www.surpluscenter.com/Electrical/Lights/DC-Mobile-Equipment-Lights/12-24-VDC-3120-LUMEN-16-LED-UTILITY-FLOOD-LIGHT-12-999-B.axd
>  off the shelf then it's real world application by
>  psubbers may be limited.
>
>
>
>  Over-spec'ing the design above requirements for typical
>  recreational operations (ie 10,000 psi capability) is likely
>  going to drive up the cost.  Also, let's remember that
>  "cheap", "low cost", and "good
>  price" are relative terms for a diverse group like
>  PSUBS so include realistic estimates of parts and
>  manufacturing especially if tooling is required.
>
>
>
>  Jon
>
>
>
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