[PSUBS-MAILIST] LED Lights

Thu Jul 23 12:42:33 EDT 2015

Cliff,
I am using a cheapo light from China I had sitting around.  I figure lets wreck a crappy light first :-)
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, 10:19 AM

 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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