[PSUBS-MAILIST] LED Lights

Thu Jul 23 12:03:35 EDT 2015

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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